Archive for the Plant Focus department

Sea thrift

May 16, 2022 • Leave a Comment

by George Papadelis

Many good gardeners have fallen prey to the notion that all perennials are low maintenance, long-lived, and long-blooming. Many of these same gardeners became familiar with perennials by buying those plants that were more common and readily available. These often included forget-me-not, delphinium, columbine, hollyhock, and sweet William. These are all beautiful, easy-to-grow plants. However, they are either biennials or short-lived. For the new perennial gardener, this may be the kind of experience that makes perennials “too hard to grow” and can discourage them from ever trying perennials again.

Bloodstone sea thrift (Armeria maritima 'Bloodstone') — **‘Bloodstone’ sea thrift (*Armeria maritima* ‘Bloodstone’) / Photo: www.PerennialResource.com**

Many perennials are, in fact, long-lived as well as long-blooming and low maintenance. Sea thrift or sea pink (Armeria) is all of these and much more.

The genus Armeria includes many varieties that vary in height, flower color and size, and leaf shape. All of these have narrow grass-like foliage, and globe-shaped blossoms that range from rosy-red to pink to white. Heights can vary from 2 to 18 inches. The individual flowers last for three weeks beginning in May, but will continue to be produced through July into August if the spent blossoms are removed. One of the unique features of sea thrift is its ability to produce so many showy flowers from a relatively small clump of grassy foliage.

Sea thrift is native to many parts of the northern hemisphere, where the soil tends to be less fertile and well-drained. The rocky, sandy, unamended soil that sea thrift prefers can usually be attained in your garden by incorporating gritty sand and small gravel into the existing soil. Sea thrift also prefers dry soil and sun. With minimal water, soil preparation, and fertilization, it is a very durable, yet rewarding perennial.

One of my favorite species is the tiny Spanish thrift (Armeria juniperifolia). This one has a very tight tuft of needle-like foliage that only stands 1 to 2 inches tall. It is covered with 3/4-inch lavender pink flowers on short stems only one inch above the foliage. After 1 or 2 years, the mound may grow to become only 4 to 6 inches wide. This little gem is outstanding for small rock gardens, miniature gardens, or trough gardens (rustic-looking containers made from a concrete-like material and planted with small rock garden plants). Also look for this one in a white form called ‘Alba.’

The most common sea thrift is ‘Splendens’ (Armeria maritima ‘Splendens’). Its species name “maritima” is derived from its tolerance to salt, which enables it to grow along coastlines where few plants can survive. It reaches a larger height of 6 to 10 inches and grows about 10 inches wide. The dark pink flowers are 1 to 1-1/2 inches wide and rise well above the foliage for a more noticeable display from a distance. Use this variety in the front of the perennial border or in a rock wall for compact and showy splashes of color. The variety ‘Bees’ Ruby’ displays even darker pink flowers above 18-inch stems. A selection known as ‘Formosa hybrids’ has wider, longer leaves and produces flowers in a range of colors. All of these are easy to grow and have a long season of color.

'Splendens' sea thrift (Armeria maritima 'Splendens’ — **‘Splendens’ sea thrift (*Armeria maritima* ‘Splendens’) / Photo: David J. Stang/Wikimedia Commons**

Sea thrifts make great companions to other spring bloomers in full sun. Use their pink flowers in contrast with the blue flowers of other perennials like creeping phlox, dwarf crested iris, or ajuga. Take advantage of their early bloom season by incorporating spring-blooming bulbs such as yellow daffodils or blue grape hyacinths. Don’t forget to include some silver foliage with these pink and blue flowers. Try an artemisia or the non-blooming form of lamb’s ears (Stachys byzantina ‘Silver Carpet’). All of these make great, long-lasting additions to a showy spring perennial border or rock garden.

Armeria promises to provide years of color from plants that ask very little in return. So, if you’re ready to grow some plants that fulfill your original perception of the perennial gardening experience, try the low maintenance, long-lived, and long-blooming sea thrift.

Sea thrift

Botanical name: Armeria (are-MARE-ee-ah)
Plant type: Perennial
Plant size: Height and width: 2-18 inches, depending on species
Habit: Clump-forming; flower stems rise above foliage mats/clumps
Hardiness: Zone 4/5, depending on species
Flower color: Light pink, deep pink, white
Flower size: 3/4 to 1-1/2 inches wide
Bloom period: May
Leaf color: Green
Leaf size: Grass or strap-like, 1 to 8 inches long, depending on species
Light: Full sun
Soil: Well-drained, infertile and dry
Uses: Rock garden, front of perennial border, trough garden, stone wall “pockets”
Companion plants: Perennials: creeping phlox, dwarf crested iris, ajuga, lamb’s ears, artemisia. Bulbs: yellow daffodils, blue grape hyacinths.
Remarks: Low maintenance. Bloom time can be extended by removing spent blossoms.

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

Tarda tulip

March 21, 2022 • Leave a Comment

As spring bulbs begin to emerge, gardeners often wish they had planted more bulbs last fall. Few “perennials” are this easy to plant, grow, and maintain. However, many bulbs do have shortcomings. Some are planted and immediately become squirrel food. Others bloom so late that gardeners have to wait a few extra weeks for the foliage to die back before annuals can be planted. And the largest concern is their failure to bloom for more than a few years in the garden. Tarda tulip may help you overcome some of these potential problems.

Every year, in late April to early May, each tarda tulip (Tulipa tarda) bulb produces 4 to 6, star-shaped flowers that are about 2 to 3 inches across. The yellow buds open almost flat, revealing bright yellow petals whose lower half is white. Unlike most of the showier hybrids of today, tarda tulip’s flower size and color lends itself to a more refined and subdued display.

Tarda tulip is one of several tulips that can be found in nature, especially if you happen to be walking around the rocky slopes of rural China. Therefore, it is referred to as a species tulip—it hasn’t been bred for bigger blooms or brighter colors. Like several other species tulips, tarda tulip is extremely hardy. Severe winters and hot summers rarely threaten its vigor. This is especially true if you can create well-drained soil that is amended with organic matter such as compost or shredded pine bark. Plant bulbs at a depth of 6 inches in full or partial sun for best results.

The other great feature of this species tulip is its ability to flower year after year after year. Many of the more popular tulip types such as parrots, doubles, single lates, etc., have exceptional flower colors and forms. These, however, rarely last for more than a few years in the garden, even with the best conditions. On the other hand, tarda tulip is a true perennial type and should last for many years with minimal or no effort.

Tarda tulip’s short, yellow and white flowers make excellent partners for slightly taller tulips. Try a rock garden tulip (Tulipa greigii) for a 10- to 12-inch background. Then use the durable blossoms of grape hyacinths as a contrasting blue, spike-shaped flower that grows to about the same six-inch height. Don’t forget spring-blooming perennial groundcovers such as creeping phlox or candytuft. These can be planted right over tarda tulip for a brilliant, double dose of color every spring.

As for the squirrels, I can offer some ideas. The most reliable deterrent is to plant your bulbs under a piece of chicken wire that is buried below the soil surface. It always is effective but can be a chore to install and is especially annoying when it gets in the way of other plantings. Repellents can also be applied to bulbs before planting. These eventually wash away, but usually succeed because bulbs are the most vulnerable for a few days after planting. The good news is that tarda tulip is one of the least expensive tulips available. So, an occasional loss to Mr. Squirrel isn’t as economically devastating as it would be with other, more costly bulbs.

In the fall, tarda tulip can be found at many garden centers alongside other species tulips. Try these true perennials in your toughest areas and take advantage of their durability and beauty. It’s likely that these little gems will outlast your other bulbs and may even spread to fill nearby open spaces. Just remember to watch out for the squirrels.

Tarda tulip

Botanical name: Tulipa tarda (TOO-lip-uh TAR-duh)
Plant type: Bulb
Plant size: 6 inches tall
Hardiness: Zone 4
Flower color: White tips & yellow centers
Flower size: 2-3 inches across, star-shaped
Bloom period: Late April to early May
Leaf color: Green
Leaf size: 5 inches long
Light: Full to part sun
Soil: Well-drained soil, amended with organic matter
Uses: Perennial border, rock garden
Companion plants: Grape hyacinths, medium height tulips (10-14 inch), spring-blooming perennial groundcovers, such as creeping phlox or candytuft.
Remarks: Species tulip; very hardy; longer-lived than the more common, hybridized tulips.

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

Butterfly weed and other milkweeds

July 7, 2021 • Leave a Comment

by George Papadelis

It turns out that one of Michigan’s most common roadside “weeds” is actually an outstanding perennial for our Michigan gardens. The brilliant orange flowers of butterfly weed (Asclepias tuberosa) can be seen blooming profusely in June and July in some of the most unfriendly sites one can imagine. Open meadows, steep slopes, and grassy fields can provide its only two cultural requirements: full sun and dry, well-drained soil.

Butterfly weed was given its common name for appropriate reasons. When in bloom, its flowers seem to attract butterflies from miles away. Monarchs are perhaps the best-known visitors to members of the milkweed family (to which butterfly weed belongs), but many other species dine on their nectar as well. Painted ladies, swallowtails, and others find it irresistible. All milkweeds are suitable lures for butterflies, so select the variety that best suits your tastes.

Butterfly weed, with its flat clusters of small orange flowers, is actually one of the few perennials available in orange. Its perennial companions in this narrow color range include poppies, red hot poker, daylilies, lilies, and crocosmia. Butterfly weed is also available in some different hues. The variety ‘Gay Butterflies’ offers a mixture that includes orange, yellow, and red. An all-yellow variety exists (‘Hello Yellow’), but is often difficult to find.

*A. tuberosa* ‘Gay Butterflies’ (Photo: Park Seed Company)

More milkweeds

Butterfly weed has another North American relative with the less flattering common name of swamp milkweed (Asclepias incarnata). The common name comes from the milky sap produced from broken stems or leaves. Swamp milkweed varieties offer flowers similar to butterfly weed, but in two different colors. One called ‘Cinderella’ produces larger, rosy-pink blossoms on more compact flower heads. ‘Ice Ballet’ yields all white flowers that create the perfect backdrop for brightly-colored butterfly visitors. Both will grow about 3 to 4 feet tall.

Tropical milkweeed (Asclepias curassavica) is another popular species of asclepias. This annual form can begin blooming as early as May when cultivated in greenhouse conditions. It produces extra vibrant orange and red bicolor blooms from spring until fall. Besides a sure death every fall, it offers everything available from the perennial forms, but boasts a longer bloom time. Like its longer-lived counterpart, this annual can also have a place in the perennial border.

*A. incarnata* ‘Ice Ballet’ (Park Seed Company)

*A. incarnata* ‘Cinderella’ (Park Seed Company)

How to grow butterfly weed

Butterfly weed is difficult to propagate. Seeds are tough to germinate and it also has a taproot that makes it almost impossible to divide. Even transplanting can be problematic. Garden centers are the most reliable source to obtain young starter plants. Once established in well-drained soil, butterfly weed can flourish for several years. Competition from grass and weeds is rarely a factor, but tree roots may pose a problem. Heavy, moist soil (which often occurs in southeastern Michigan’s clay) must be amended with coarse sand, compost, and/or pine bark to improve drainage. Otherwise, good garden soil is all that’s required for this two foot tall, native perennial to produce its flowers. In more harsh environments, evergreen boughs placed directly on the plants for winter protection would certainly be worthwhile. Be patient in the spring, since the leaves of butterfly weed, like several other perennials, are very late to emerge. Gardeners often mistake plants as dead and then discard them before new growth is able to develop.

Besides attracting butterflies and adding some color to your borders, all varieties make excellent cut flowers. Blooms allowed to remain on the plant give way to narrow seedpods, which provide an additional dimension to the plant. These can be harvested before they split open and dried as ornamental seedpods, adding a unique element to any flower arrangement.

Butterfly weed is a Michigan native that is both versatile and rewarding for the true Michigan gardener. Whether butterfly weed is in your yard, in a vase, or on the menu for a passing butterfly, it is one weed you’ll never want to pull out.

*A. curassavica* ‘Red Butterfly’ (Photo: Johnnyʼs Selected Seeds)

Butterfly weed

Botanical name: Asclepias tuberosa (as-KLEE-pee-as)
Plant type: Perennial
Plant size: 2-3 feet tall; 2 feet wide
Hardiness: Zone 4
Flower color: Orange, orange/yellow/red, pink, white
Flower size: 1/4 inch wide, on clusters
Bloom period: Midsummer
Leaf color: Green
Leaf size: 4-6 inches long, lance-shaped
Light: Full sun
Soil: Dry, well-drained for butterfly weed (A. tuberosa). As its common name indicates, swamp milkweed (A. incarnata) prefers more moisture.
Uses: Perennial garden, meadow, roadside, cut and dried flower arrangements.
Remarks: Native to Michigan. Attracts butterflies. Very slow to emerge in spring, so be careful to allow new growth to appear. Has a taproot, which makes division difficult.

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

Gazania

June 2, 2021 • Leave a Comment

by George Papadelis

Gazania are a multi-purpose plant with high-performance dose of both attractive flowers and showy foliage. They are one of the most durable annuals available for full sun, lots of heat, and minimal water. Gardeners in New Mexico and Arizona have made this one of their most popular bedding plants along with other heat tolerant annuals like vinca, verbena, and zinnias. Gazanias have brilliant 3- to 4-inch daisy-like flowers in shades of yellow, orange, brown, pink, red, and ruby. The individual petals are pointed, sometimes curled, and may be more than one color. The base of each petal may be uniquely marked by a completely different color such as olive, brown or black. Others, like the variety ‘Daybreak Red Stripe,’ have bright yellow flowers with a red stripe the full length of each petal. The flower centers of most gazanias are shades of gold. These bright color combinations and a history of low maintenance have made this African native popular.

*Gazania* ‘Daybreak Red Stripe’ / Photo: W. Atlee Burpee & Co.

The foliage of gazanias is also very attractive. The long, thick leaves of most varieties are blue-green on top and silver on the bottom. This silver sheen makes gazanias extra attractive even when they are not in flower. One variety called ‘Talent’ has flowers that are multi-colored and leaves that are very silvery on the top and bottom. In fact, they are so silver that plants that are not in flower are often mistaken for the completely silver annual called dusty miller. I love using this 10-inch tall variety as a silver ribbon to plant in front of blue annuals such as heliotrope or mealycup sage (Salvia farinacea). The gazania foliage and flower combo makes it perfect for containers when planted all by itself or with a cascading blue partner such as fan flower (Scaevola) or miniature trailing morning glory (Convolvulus sabatius).

Those of you searching for interesting annuals to help add color to perennial plantings may want to consider gazanias. The silver foliage of plants like gazanias can be used to combine and soften other colors in your perennial beds. Some varieties can be found with flowers of separate colors. The Daybreak series, for example, has flowers available in yellow, orange, pink, white, bronze, as well as the red-striped variety. The Chansonette series is available in six colors as well. These work well in both perennial plantings and annual combinations. Try a yellow variety with red salvia or an orange variety with purple petunias.

*Gazania* ‘Talent Yellow’ / Photo: Benary Seeds

Gazanias have an interesting trait that should be considered before planting. If you would like to enjoy your gazania flowers in the evening, you may need to resort to a photograph. Gazania flowers close when the sun sets and reopen each morning. They also stay closed when it becomes cloudy and when it gets too cold. Therefore, if you need flowers 24 hours a day, gazanias may not be for you. On the positive side, gazanias are both frost and freeze tolerant. They can be planted in mid-April when few other annuals will survive. In fact, some parts of the country call this plant a perennial (it is hardy to zone 8).

Gazanias are extremely low maintenance. Once established, watering will rarely be necessary. Individual flowers last for several weeks so spent blooms will seldom need removal. Take advantage of this plant’s durability, versatility, and ease of care. Try it in your perennial beds, annual plantings, or containers. Even in your sunniest, hottest, driest area, its flowers and foliage promise to provide an interesting and showy display long into the fall.

*Gazania* ‘Daybreak Mix’ / Photo: Park Seed Co.

Gazania (gah-ZAY-nee-uh)

Common name: Gazania
Plant type: Annual (a tender perennial)
Plant size: Height: 8-10 inches, Width: 10 inches
Habit: Low-growing, with basal leaves and long-stalked flowers
Flower colors: Yellow, orange, red, pink, white, bronze; flower centers can be gold, olive or brown
Flower size: 3-4 inches across
Bloom period: Early summer to frost
Leaf color: Blue-green on top, silver on bottom; ‘Talent’ series is all silver
Leaf size: Length: 4-5 inches, Width: 1/2 inch
Light: Full sun
Soil: Well-drained, light, sandy; tolerates dry, hot soil
Uses: Annual beds, containers, perennial borders
Companion plants: Salvias, petunias; other drought-tolerant plants (verbena, vinca, zinnia)
Remarks: Needs minimal water; flowers close in the evening; attractive foliage

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

Trillium

March 18, 2021 • Leave a Comment

by George Papadelis

For hundreds of years, trillium and its name have been used to symbolize purity, simplicity, elegance, and beauty. The name trillium has graced the marquees of restaurants, country clubs, resorts, software companies, consulting firms, and numerous other businesses. Every spring, thousands of Americans journey into the woods to admire the showiest of our spring woodland flowers.

In Ohio, where all 88 counties have masses of wild trillium, it was selected as the state’s official wildflower. Its flowers have twice graced a U.S. postage stamp. Even our Canadian friends across the bridge have declared white trillium (Trillium grandiflorum) the official provincial flower of Ontario. Other parts of the world share our passionate admiration for this plant. In Europe, where trilliums are not found in nature, gardeners dedicate vast amounts of time and money acquiring them, especially rare species. In Japan, a cult-like interest has developed. Gardeners have fervently established collections and written numerous publications describing them.

Sessile trillium (*Trillium sessile*)
Photo: Steven Nikkila – Garden A to Z

Trillium species

The most readily available species is white trillium (Trillium grandiflorum). This has large, pure white flowers up to five inches across. These develop in great abundance throughout the northeastern United States, including Michigan. Its flowers usually fade to a dull pink and sometimes red.

Red trillium (Trillium erectum) is a much more diverse species, with flowers ranging from red to purple to yellow-green and beige. It also grows wild in the Northeast and Michigan.

Yellow trillium (Trillium luteum) is the most common yellow species. It originates from areas around eastern Tennessee. One of its most notable features is the beautiful dark green leaves decorated with pale green markings. The flowers are relatively small.

Prairie trillium (Trillium recurvatum) bears maroon-purple to clear yellow flowers with strongly curved petals. Several other species and a few named varieties are readily available. Most varieties grow about 12 to 18 inches tall once established in the garden.

**Red trillium (*Trillium erectum*) / Photo: Steven Nikkila – Garden A to Z**

Companion plants

Trilliums typically bloom in late April or early May when dozens of perennials and bulbs are available as companions. Several spring-flowering bulbs will tolerate shade, and a few flower at the same time as trilliums. Try them with daffodils, tulips, Siberian squill, grape hyacinths, summer snowflakes, glory-of-the-snow, and Grecian windflower (Anemone blanda). Pansies and violas planted the previous fall or in early spring will offer the largest color range to coordinate with your trillium flowers. Early May-blooming perennials for shade include snowdrop anemone (Anemone sylvestris), foamflower (Tiarella), fern-leaf bleeding heart, leopard’s bane, and the beautiful blue-flowering perennial forget-me-not (Brunnera macrophylla). Several other woodland plants such as woodland phlox (Phlox stolonifera) and yellow dogtooth violets (Erythronium canadensis) should also be at peak bloom.

Growing trilliums

Trilliums are North American and Asian natives that typically thrive in moist, woodland settings where rich, acidic soil is prevalent. Gardeners with some shade can create this type of soil by incorporating organic soil amendments such as aged pine bark, Canadian peat moss, leaf mold, composted manure, or compost. During dry spells, plants may require some supplemental watering.

As gardeners, many of us have developed questions (or fears) about growing this somewhat mystical plant. It doesn’t help that the typical garden center only sells tiny, flowerless plants that show little promise of ever coming to fruition. Perhaps the most important aspect of appreciating this plant can be expressed in one word: patience. These small plants are much more durable than they appear. Most species will eventually develop into clumps of flowers that are quite persistent even in less than perfect conditions. This clumping process often takes 2 to 4 years. At least it’s faster than growing them from seed. If the seed germinates, it may take as long as ten years to bloom.

**Yellow trillium (***Trillium* *lute*um) / Photo: Steven Nikkila – Garden A to Z

Another perplexing aspect of growing them is the short period of time plants are visible in the garden. The “root” is really a sort of underground stem called a rhizome. This rhizome stores food all winter until temperatures rise in spring. In early May, the rhizome sends up branches that typically support three leaves and a single three-petal flower. The short time during which leaves are present is the plant’s only chance to gather energy from the sun. Therefore, picking flowers and leaves will diminish the plant’s ability to produce food. It won’t kill a healthy plant, but frequent picking will eventually reduce flowering. The number of flowering branches depends on the age of the plant, the size of the rhizome, and the overall energy stored in the rhizome.

Next comes the strange part. Just a few weeks after blooming, the branch and leaves wither away with no visible signs of life. The rejuvenated rhizome will await winter dormancy, which is mandatory for next year’s bloom production. Many woodland plants and spring-blooming bulbs (such as tulips, daffodils, crocus, etc.) enter an early-summer dormancy. These plants, like trilliums, are described as spring ephemerals. If you are thinking of shopping for a potted trillium in summer or fall, visually evaluating a plant’s vigor is almost impossible. However, a gentle probing of the soil to locate a firm, sleeping rhizome should do the trick.

Red trillium (*Trillium erectum*)
Photo: Jonathon Hofley – Michigan Gardener

Trilliums in the wild

Two species are currently on the U.S. threatened and endangered species list. Trillium persistens and Trillium reliquum only occur naturally in very small areas of the southeastern United States. In Michigan, one species, Trillium undulatum, is on the endangered list. This means it only exists in a few sites and is at great risk of becoming extinct in our state. Three varieties are on the Michigan threatened plant list: Trillium nivale, Trillium sessile, and Trillium recurvatum. Threatened plants only exist in a dozen or so sites and are at great risk of becoming endangered. All of the threatened and endangered trillium cannot be collected under any circumstances. All other trillium in the state of Michigan are protected in the following way. The only way these can be collected is by owning the land from which they are harvested, acquiring a permit to collect them from the Department of Natural Resources, or by acquiring a bill of sale from the property owner. All trillium located in national forests are also not collectible.

Since it is legal to collect unthreatened and unendangered trillium that are located on your own land, “nurseries” can own land from which they may legally collect wild trillium. Fortunately, responsible commercial collection of trillium has had little effect on most species. Almost all trillium have developed stable masses in their natural habitats, and more and more nurseries are offering wildflowers that are propagated on site. As gardeners and stewards of our environment, we should seek out these sources and avoid plants that are illegally collected.

The biggest two concerns for the sustenance of their populations are animal grazing and urban development. Repeated grazing from deer can eventually weaken plants and wipe out large areas. In regions where deer populations have increased, trilliums have often disappeared. A deer repellent would be a wise investment if deer browse in your trillium bed. In cases where a plant’s habitat is limited, populations are also suffering from commercial development. Clear cut lumbering and urban sprawl have an enormous impact on all wildflowers. In cases where development is unavoidable, the proper agencies should be contacted to save important plants. A great source of trillium is one that has a permit to rescue plants that would otherwise fall victim to bulldozers.

Trillium are available from many garden centers as spring-flowering plants in small containers. These can be treated just like any other perennial. More and more retailers are selling them packed in plastic bags with some peat moss. Make sure the rhizomes are firm and try to plant them before the leaves emerge. Bury rhizomes horizontally about 2 to 4 inches deep in the moist, rich soil that most woodland wildflowers love.

Remember to be patient—good things come to those who wait. In time, your little plant should form colonies that you and your garden’s admirers will enjoy for years to come.

Trillium – (TRILL-ee-um)

Plant type: Perennial
Plant size: Most are 12-18 inches tall and 12 inches wide
Habit: Clump-forming
Hardiness: Most are zone 4 or 5
Flower color: White, red, pink, yellow
Flower size: Up to 3 inches wide
Bloom period: Late April to early May
Leaf color: Green, sometimes mottled with pale green, dark green, or maroon
Leaf size: Up to 8 inches long and up to 6 inches wide
Light: Dappled shade to shade
Soil: Moist but well-drained, rich in organic matter
Uses: Woodland garden, shady border
Companion plants: Spring-flowering bulbs (daffodils, tulips, grape
hyacinths, etc.), spring-flowering perennials (foamflower, fern-leaf bleeding heart, perennial forget-me-not, woodland phlox, etc.)
Remarks: Patience is a must: trilliums take time to become established; the plants go dormant in summer (stems & leaves wither away)

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

Plant Focus: Crocus

September 1, 2020 • Leave a Comment

For a gardener, there are few sights as welcome as the first crocus of the year, peeking its flowers through the freshly melted snow of late winter. Crocus is a very hardy perennial and one of the few plants that can bloom as early as February or March. By being hidden deep in the soil, crocus corms are naturally insulated from severe temperature changes, ice and wind. Flowering is initiated by just a few consecutive days of temperatures above freezing. Once the first few inches of soil can thaw, flowers emerge and will last for several weeks despite more wintry weather. Crocus flowers can protect themselves by closing up in the evening and also whenever they experience severe weather.

**‘Yellow Mammoth’ (Photo: Dutch Gardens)**

Crocus have long been popular with gardeners for several reasons. Their durable flowers are available in many colors including yellow, white, purple, blue, and pink. One plant will usually return year after year and develop offspring that can produce additional flowers in beautiful drifts. The two-inch flowers are made up of 6 oval petals that surround 3 prominent yellow to orange stamens. Crocus grow from one-inch corms rather than actual “bulbs.” Both are just compressed stems: bulbs consisting of fleshy scales and corms being more solid. Gladiolus is another example of a corm.

**‘Whitewell Purple’ (Photo: John Scheepers, Inc.)**

Crocus are native to the rocky slopes of the Mediterranean countries and southwest Asia. They adapt to cold winters, full or partial sun, and well-drained soil. Most Michigan gardeners have the first two, but well-drained soil may have to be created if clay is prevalent. Drainage can be improved by adding aged pine bark or compost to your soil. Since crocus corms are planted 3 to 4 inches deep, only about 4 inches of soil below them needs to be well-cultivated. Corms should be at least 3 inches apart. However, this is the type of bulb that looks great planted in more natural and random masses.

Most crocus have only one serious threat to their perennial existence. Hungry bunnies seem especially tempted by the leaves, flowers and corms of several species. Corms can be protected by several methods. Gravel worked into the soil above the corms will make digging them up difficult. Liquid or powder deterrents can be used to treat corms before planting. Keep in mind that freshly planted bulbs and corms are most likely to create curiosity amongst browsers. Once established, they are rarely disturbed. If all else fails, you can plant in below-grade, wire mesh cages that are impenetrable. To protect leaves and flowers, apply a granular deterrent or a spray.

**‘Ruby Giant’ (Photo: John Scheepers, Inc.)**

There are many varieties of spring-blooming crocus but most of the hardy ones fall into four species. Crocus ancyrensis is golden bunch crocus. The selection ‘Golden Bunch’ produces up to five deep orange-yellow flowers in a “bunch” per corm. Of the four species, this is one of the earliest to bloom; late February is not unusual if Mother Nature is cooperating. This is also one of the more vulnerable to attack from the bunnies.

**‘Jeanne d’Arc’ (Photo: John Scheepers, Inc.)**

Crocus chrysanthus is available in several varieties, all of which are referred to as snow crocus or golden crocus. ‘Cream Beauty’ is a strong grower that is primarily white with a white center. ‘Ladykiller’ is also white but with purple on the outside of the petals. ‘Advance’ is yellow inside but the outside is unique because the petals alternate creamy yellow and purple. Corms produce 1 to 4 flowers each in late February or early March. Like C. ancyrensis above, rabbits admire this species.

Crocus tommasinianus is a wonderful choice for several reasons. This species is the most pest-resistant crocus available. If you have lost crocus to rabbits or squirrels, this may be the choice for you. C. tommasinianus is also the most prolific grower. It will quickly naturalize to form masses of flowers. The most readily available variety is ‘Barr’s Purple.’ Its deep violet petals fade to a bright white center that is highlighted by bright orange stamens. It blooms almost as early as the above two species, usually in early March.

The most popular species is Crocus vernus or Dutch crocus. Unlike the previous species, one large flower with large gold stamens is produced from each corm. It is available in several colors ranging from white to stripes to purples. ‘Jeanne d’Arc’ is a bright white with large flowers. ‘Pickwick’ has large white flowers with dark lavender stripes inside and out. ‘Remembrance’ and ‘Flower Record’ are deep lavender and pale lavender respectively. Dutch crocus usually bloom from March to early April.

Fall is a perfect season for planting. Cooler weather means less heat stress for both plants and people. Plants are naturally becoming dormant and are far less susceptible to drying out and experiencing transplant shock. Fall is also the only season for planting spring-blooming bulbs and corms. Once the ground freezes, the opportunity is lost and you’ll regret not having these heralds of spring glowing in your early season garden. Crocus are relatively inexpensive and are available almost anywhere bulbs are sold. With minimal effort this fall, you can enhance your existing landscape and welcome spring with the bright blossoms of crocus.

**‘Blue Pearl’ (Photo: Van Bourgondien)**

Crocus CRO-kus
Plant type: Corm (commonly referred to as a “bulb”)
Plant size: 3-5 inches tall
Habit: Clump-forming
Flower colors: Purple, violet, reddish- purple, lilac, yellow, cream, white
Flower size: 2 inches wide
Bloom period: Late winter to early spring
Light: Full to partial sun
Soil: Well-drained
Uses: Plant in natural drifts in the perennial border, lawn or rock garden
Remarks: The corms develop offspring that can produce additional flowers to create a naturalized look

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

RELATED: Colchicum and Fall Crocus

ELSEWHERE: More on Crocus at Chicago Botanic Garden

Plant Focus: Pasque Flower

March 31, 2020 • 2 Comments

The spring days are growing longer, the birds are quickly emptying the feeders, and the flowers have begun to emerge. Bulbs like crocus and daffodils are in bloom, but in time, only the old, tattered foliage will remain. Some of the woodland wildflowers, like trillium and bluebells, are also in color, but they too will quickly disappear. Unlike so many early bloomers, pasque flower, will perform well in the spring and continue to be showy well into the summer.

Botanically referred to as Pulsatilla vulgaris, pasque flower sends up purple, reddish, pink or white 2-1/2 inch flowers in April and May. These flowers have 6 large petals (actually sepals) and a bright yellow center. After flowering begins, the spring leaves emerge and are equally showy. These leaves glisten with silky hairs that are exceptionally ornamental.

The performance has just begun, for when the spring flowers finish blooming, the seed pods form. These beautiful, silky, puff balls last well into the summer when all of the flowers have passed. The beautiful spring blossoms and clusters of seed pods make this an outstanding perennial for the front of the border or rock garden. Pasque flower grows 10 inches tall and 10 inches wide, and in our climate, it thrives in both full or partial sun. The plant will last for several years in most gardens, but performs best in a well-drained soil. Rarely does it suffer from insect or disease problems.

Pasque flower is somewhat difficult to find, but is well worth the effort. Young plants offered at garden centers quickly mature to showy clumps of vibrant flowers and striking foliage. ‘Rubra’ is the red form and the species is the purple form (just Pulsatilla vulgaris). These varieties are the easiest to locate, but I especially like the pink form, which, unfortunately, is rarely available. However, a more common German variety called ‘Papageno’ is a wonderful mixture which contains all colors, including the elusive pink.

Take advantage of the many features of this very underused perennial. Few spring-blooming perennials rival the extended display that pasque flower can provide. A tidy habit, wonderful flowers, and beautiful foliage are just some of the traits that make pasque flower a worthwhile addition to your garden.

Pasque flower

Botanical name: Pulsatilla vulgaris
Plant type: Perennial
Plant size: 10 inches wide and tall
Flower colors: Purple (most common), red, pink, or white
Flower size: 2-1/2 inches
Bloom period: April and May
Leaf colors: Silky green
Leaf size: Up to 6 inches long
Light: Full to partial sun
Soil: Prefers well-drained soil
Uses: Front of the perennial border or in the rock garden
Remarks: Leaves appear after the flowers. Silky hairs on the leaves make them glisten. Puffy seed heads form after the flower blooms are finished and are as attractive as the flowers.

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

Read more: Growing pasque flower from seed

Plant Focus: Viola

March 3, 2020 • Leave a Comment

*Viola cornuta* (Photo: Jonathon Hofley / Michigan Gardener)

by George Papadelis

In the spring, the earliest bedding plants to appear at your local garden center are violas and pansies. These are usually available in flats and look similar except violas have smaller flowers than pansies. So, what is the real difference between violas and pansies and is this the same “violet” that has spread all over my friend’s yard? As a matter of fact, the plants referred to as “violas,” “pansies,” and “sweet violets” are all in the same group of plants, namely the genus Viola.

*Viola cornuta* ‘Jersey Gem’ (Photo: White Flower Farm)

Pansies are the result of crossing different species of violas. These “hybrids” (called Viola x wittrockiana) have flowers 2 to 4 inches across and include an incredible range of colors including white, black and practically every color in the rainbow. These plants will tolerate freezes and frosts, so gardeners can plant them as early as April 1 here in Michigan. They will flower profusely all spring and if old flowers are removed, they will most likely continue through the summer. The cool fall will encourage more flowering, which often lasts until the winter holidays. In our climate, pansies planted in a protected area usually return one more season for another performance, although somewhat less spectacular. Protected areas include the south side of the house and the cooler east side.

The smaller-flowering viola (Viola cornuta), sold in flats every spring, has evolved greatly. Several series such as the “Princess” series and the “Sorbets” have introduced new colors and color combinations that rival the closely related Johnny jump-up (Viola tricolor). Violas planted in our climate last one or two seasons. Just like pansies, spent flowers must be removed to encourage flowering through the hot summer.

Viola

Botanical Name: Viola cornuta (vy-OH-lah kor-NEW-tah)
Common Name: Violet, horned violet
Plant Type: Hardy annual/tender perennial
Plant Size: 5-10 inches tall
Flower Color: White, purple, violet, yellow, maroon
Flower Size: 1-1/2 inches wide
Bloom Period: Spring to fall
Light: Partial sun to sun
Soil: Well-drained, moist
Hardiness: Zone 5
Uses: Areas that are partially sunny, yet moist
Remarks: Remove spent flowers to encourage blooms through the summer

The dangerous member of this group is Viola odorata or “sweet violets” which are often just referred to as “violets.” These are very perennial, produce fragrant, small flowers in the spring, and may spread everywhere if you let them. Like violas and pansies, sweet violets produce seeds which may germinate and produce more plants. However, sweet violets also send underground stems called stolons in all directions, which may be difficult to find and remove. This invasive nature makes it an excellent groundcover or a wildflower in a naturalized site. Sweet violets have also been planted for as long as gardens have existed. The flower market in Athens, Greece sold sweet violets as early as 400 B.C. Its fragrance has been used by the perfume industry for centuries and is still being used by some today.

All members of the genus Viola produce edible flowers. Chefs all over the world use these showy blossoms as an attractive garnish, especially on salads. The blossoms also make great cut flowers and are among the most popular flowers for pressing. Members of the Viola family grow best in partial sun but full sun can be tolerated. High temperatures and drying out will cause stress, so keep the soil moist and cool if possible.

*Viola cornuta* ‘Cuty’ (Photo: White Flower Farm/Michael Dodge)

Gardeners looking for something different may want to try the purple-leafed viola (Viola labridorica) for its attractive foliage and fluorescent purple flowers. Other violas such as Viola koreana even have attractive silver patterned leaves. The bird’s foot violet (Viola pedata) is easy to identify because the leaves look just like a bird’s foot.

From a naturalizing habit to being self-contained, the genus Viola is so diverse that every gardener is sure to have a spot for at least one variety!

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

Plant Focus: Sourwood

September 30, 2019 • Leave a Comment

Photo: Steve Nikkila / Perennial Favorites

by Eric Grant

The autumn winds of October bring thoughts of pumpkins, apple cider and hay rides. The season is announced with the anticipation of a kaleidoscopic array of fall colors. These changing hues celebrate the landscape at one of its finest moments. Few trees can herald the autumnal change with the vibrancy of sourwood (Oxydendrum arboreum). Sometimes called the sorrel tree (referring to its leaves), or lily of the valley tree (for its blooms), fall is only one of four outstanding seasons for this little known tree of wonders.

“Spring green” must have been defined by the foliage of this tree. Its soft, but stately outline breaks the winter rest by cloaking itself in the freshest shades of green. Its glossy foliage always seems to shimmer as it progresses through its rainbow range of color. When other flowering trees have finished their brief show, sourwood is about to embark upon a stunning and extended display of fragrant blooms. By mid June, the branches of this tree are generously graced with delicate fronds, which gently hang amidst the now dark green foliage. These creamy white panicles are abundantly tipped with small white “bells” offering an effect not unlike Victorian lace thoughtfully woven throughout the canopy. Sourwood is a tree that refuses to leave its glory with faded flowers. It continues to build its drama beyond the blooms, which last for weeks. Even once the flowers fade, the skeletal lace that held them remains for months, and continues to endow the tree with visual pleasure from the end of spring to beyond the autumn. This is a showy feat upheld by few other trees.

Now comes October. Sourwood is in the midst of act three. The performance is one of color and form, which on its own upstages burning bush, sugar maples, and other outstanding fall color plants. In their presence, however, sourwood only stands to enhance and compliment their beauty. This tree now offers a vibrant display of yellow and purple splashed amidst its predominant color—one of the most brilliant reds I’ve seen on any plant! The intensity of color is richly translucent and always draws remarks of awe. By October’s end, even though it will have dropped its leaves, sourwood does not abandon aesthetic pleasure. As winter winds approach, it again reveals its soft structure and its dark and furrowed bark, a most appealing silhouette against the winter snow. It waits in rest, to begin its cycle again, secure that its series of encores will never disappoint its audience.

Native from the Midwest into the Smoky Mountains, this problem-free tree will mature to 25 feet or so. Given its medium size and a slightly rounded, pyramidal shape, it is easily incorporated into most landscape settings. It enjoys full sun, but tolerates light or dappled shade equally well, and is often found thriving along woodland borders. Sourwood performs well in average to acidic soils, and from loamy peat to sandy beds. While it prefers relatively moist soils, once established, it can even withstand dry seasons. This tree appreciates some shelter, but for the Michigan gardener, is generally less temperamental than dogwoods or magnolias, which are more common flowering trees of comparable size.

Sourwood is a tree of prominence in any season and deserves consideration in the modern landscape. It is rewarding to find a plant with so many attributes that has not been overused. In fact, as one of landscape’s best kept secrets, its novelty offers one of the highest prizes for gardeners—this is a plant your neighbor doesn’t have!

Sourwood

Botanical name: Oxydendrum arboreum (ox-ih-DEN-drum ar-BORE-ee-um)
Plant type: Deciduous tree
Plant size: 25-30 feet tall, 20 feet wide
Growth rate: Slow
Habit: Pyramidal shape, with drooping branches
Hardiness: Zone 5
Flower color: White
Flower size: 1/4 inch long on 4- to 10-inch long clusters
Bloom period: Summer
Leaf color: Green in spring, turning to dark green; red, yellow and purple in the fall
Leaf size: 3-8 inches long, 1-1/2 to 3-1/2 inches wide
Bark: Grayish brown to black
Light: Full sun to partial shade. Flowering and fall color are best in full sun.
Soil: Well-drained, average to acidic, moist soil. Does fairly well in dry soils.
Uses: Specimen tree
Remarks: Native American tree; four-season interest.

Plant Focus: Obedient Plant

September 4, 2019 • Leave a Comment

Physostegia virginiana ‘Pink Bouquet’ (Photo: Jonathon Hofley / Michigan Gardner) — *Physostegia virginiana* ‘Pink Bouquet’ (Photo: Jonathon Hofley / Michigan Gardener)

By George Papadelis

Obedient Plant is a truly versatile plant, with many desirable features that make this North American native an asset in a sunny perennial garden. The flowers somewhat resemble a dragon’s head and thus the common name of “false dragonhead” evolved. These one-inch flowers come in white or shades of pink and are formed in straight rows along a narrow, pointed, spike-like flower head. Although it is a bit deceiving, the common name “obedient plant” developed for another good reason. If pushed to one side, the individual flowers stay in that position for quite a while and are therefore “obedient.” In his book, The Harrowsmith Perennial Garden, Patrick Lima describes it this way: “If you have nothing else to do, you can reposition the individual flowers, which are attached to their stems by the botanical equivalent of a ball-and-socket joint.”

The term “obedient” cannot be confused with the plant’s growth habit, which is, in fact, quite the opposite. If left to do as it wants, this plant produces underground stolons that will make a large clump from a single plant in just one season. This is especially true in well-cultivated, rich soil. Therefore, I recommend planting in poorer soil or be prepared to divide this spreader every year or two in the spring.

Physostegia virginiana ‘Variegata’ (Photo: Eric Hofley / Michigan Gardner) — *Physostegia virginiana* ‘Variegata’ (Photo: Eric Hofley / Michigan Gardener)

Left: Physostegia virginiana (Photo: Stephen Still) Right: Physostegia virginiana ‘Variegata’ (Photo: White Flower Farm/Michael Dodge)

Obedient plant likes full sun and may require staking if planted in part sun or in rich soil. It will begin blooming in August and will continue through the end of September. It has strong, straight stems and long-lasting flowers that make this a popular and beautiful cut flower.

Several different varieties are available. ‘Summer Snow’ is a nice 28-inch tall, white selection, but the most popular color is pink. ‘Pink Bouquet’ is widely used, but grows 3 to 4 feet tall. For a deeper pink on a less floppy, 20-inch tall plant, try ‘Vivid.’ For a wonderful combination of flowers and foliage, use ‘Variegata,’ which has the typical pink blooms but also glowing, white-edged leaves. These stand out in any flower bed and give this variety a much longer season of interest.

If you are willing to curb this plant’s appetite for space, Physostegia may work well for you. As a cut flower or a late-blooming perennial, this plant grows easily. If all else fails, you can always show a fellow gardener why this is called the obedient plant!

Obedient Plant

Botanical name: Physostegia virginiana (figh-so-STEE-jee-a vir-jin-ee-AH-na)
Common name: Obedient plant, false dragonhead
Plant type: Perennial
Plant size: 20 to 42 inches tall
Flower colors: White, rich pink
Flower size: 1 inch long, on spikes above the foliage
Bloom period: August and September
Leaves: Green, narrow, 3 to 5 inches long; also green with white edges
Light: Sun to partial shade
Soil: Grows in most soils; poorer soils will slow rapid spreading
Uses: Cut flowers, wildflower garden, larger naturalized areas
Remarks: Will spread aggressively. If used in the perennial border, plan on lifting and dividing every year or two. May require staking when grown in partial shade or highly fertile soil.

George Papadelis is the owner of Telly’s Greenhouse in Troy and Shelby Township, MI.

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Archive for the Plant Focus department

Sea thrift

Tarda tulip

More milkweeds

How to grow butterfly weed

Butterfly weed

Gazania (gah-ZAY-nee-uh)

Trillium species

Companion plants

Growing trilliums

Trilliums in the wild

Trillium – (TRILL-ee-um)

Pasque flower

Viola

Sourwood

Obedient Plant