Do some of the leaves on your broad leaved evergreens turn brown and fall off during the winter? Or have what’s called ‘winter burn’; when the edges of the leaves turn brown over the winter but don’t fall off ? If so, there is something you can do to prevent this leaf damage and loss.
All evergreens lose moisture through their leaves in winter, especially broad-leaf evergreens such as Rhododendron, Azalea, Andromeda, Laurel and Boxwood. If planted in an unprotected area open to cold, drying winds, evergreens are susceptible to desiccation; a condition in which the foliage dries out, turns brown and may drop. To decrease water loss, spray and coat both sides of the leaves with an anti-desiccant such as Wilt-Pruf or Wilt Stop during a day in mid to late November with temperatures above 40 degrees . Make sure it isn’t going to rain or snow during the next couple of days or the spray application may wash off. If you didn’t get to this task in November, then in January if there is a day and evening that stays above 40 degrees, you can treat your shrubs then.
You can purchase Wilt-Pruf or Wilt-Stop at most local garden centers or hardware stores that have a gardening department. (Note: Do not spray arborvitae, junipers, blue spruce or cypress). And, for extreme weather conditions, you can build a protective shelter for your evergreen using stakes and burlap.
You can also use an anti-desiccant spray to prevent leaf dehydration over the winter on cut broad leaved evergreen leaf branches you use for making winter wreaths, swags, and decorations in window boxes. Spray the leaves before you wire the branches together. The spray takes less than an hour to dry.