Archive for the evergreens tag

How do I overwinter small potted evergreens?

November 4, 2020 • Leave a Comment

Can I overwinter boxwoods in plastic pots (about 5-gallon size)? I’m not sure what variety they are. Or should I plant them in the ground even though it is November?

Any small ornamental evergreen or conifer in a container needs special treatment to overwinter a zone 5 winter (-20 degrees). If you have the space, you can bury the entire container in the ground and mulch leaves and compost over the base to protect it from freeze and thaw. If the location is subject to winds, a wind barrier of burlap or fabric to protect the leaves and needles is essential to avoid desiccation. You can also surround them with a staked chicken wire cage and fill the space with fall leaves. This also protects against sunscald. If no ground space is available, then place the boxwood containers in a sheltered area, cluster them together for protection, and place a windbreak around them for added protection from desiccation. Once the soil is frozen, the shrubs can’t take up moisture through their root systems to replenish what is lost in their leaves. You can also use an anti-desiccant spray on the foliage to further prevent moisture loss.

Once ground soil shows signs of thawing, night temperatures remain above freezing, and you see signs of spring growth on other plants, then you can remove the heavy winter protection. Give them a few weeks to acclimate and day temperatures to warm before moving them from their sheltered location.

Web Extra: Pruning to make great evergreens

October 31, 2013 • Leave a Comment

To read the full article by Janet Macunovich on pruning evergreens, pick up a copy of the Nov/Dec, 2013 issue of Michigan Gardener in stores or find it in our digital edition.

Captions by Janet Macunovich / Photos by Steven Nikkila

Even a tiny branch (circled) has great potential. Once clipping changes its position from shaded interior to sunny outer edge, this wimpy twig can become a husky, densely feathered leader.

Evergreen pruning can be done at any time. I can even thin at one time, and cut back overall at a different time. I take advantage of that in winter when we need long branches for decorations. Look at all the great cuttings I've gathered just from thinning this boxwood (left) and these hollies (right). — Evergreen pruning can be done at any time. I can even thin at one time, and cut back overall at a different time. I take advantage of that in winter when we need long branches for decorations. Look at all the great cuttings I’ve gathered just from thinning this boxwood (left) and these hollies (right).

Work with the natural shape of the plant and you can do all the cutting at once, using pruners. Most stems are clipped by one year's growth. The thickest are cut by two years'. These shrubs were a matched set five minutes ago. They will be again in five more minutes once I've clipped the one on the left. — Work with the natural shape of the plant and you can do all the cutting at once, using pruners. Most stems are clipped by one year’s growth. The thickest are cut by two years’. These shrubs were a matched set five minutes ago. They will be again in five more minutes once I’ve clipped the one on the left.

If a shrub has become too big (photo 1), I wait until early spring to cut and thin. For instance, I cut and thinned these boxwoods shortly after budbreak (photo 2). At other times all this previously sheltered wood and foliage would have been suddenly exposed to summer heat or wintry cold. Such quick changes can kill leaves and make wood die back even further than it was cut. Recovery was well underway in August of that same year (photo 3).

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Archive for the evergreens tag