With all of the winter injury this year my rhododendrons have lost many leaves. They are recovering now but the new leaves are much higher and reveal more of the woody stems. Is there a way to prune to encourage leaf development in the lower portion of the shrub?
Remove any branches that are winter-killed or damaged. In the spring, judiciously prune back half of the plant by about half their height. Leave the other half of the plant alone to reduce the shock. The following spring, perform the same procedure to the untouched half. You may have to forsake a few blossoms for a season in order to get lush growth established. Plant other perennials around the base to mask the bare branches until it fills in. Make sure your rhododendrons are watered regularly even in the fall so that they go into winter with adequate soil moisture. Also ensure adequate mulch, at least 3 inches deep. Re-evaluate your site conditions. You may need to provide protection from winter wind and sun that cause desiccation. Make sure the soil is well-amended with compost. Rhododendrons are actually light feeders. If the soil is properly enriched, they will get all their nutrients from the soil and will not require a rigorous fertilizing schedule. A healthy plant stands a far better chance against the unpredictability of Michigan winters.
