Pruning Overgrown Evergreen Shrubs Few evergreen shrubs tolerate heavy pruning.

As a result, large, overgrown specimens are often leggy and unattractive. Old, neglected lilacs can be renewed or rejuvenated by pruning. Home gardeners can choose between two different pruning methods. One way to renew a large, overgrown lilac is to cut the entire plant back to within 6 to 8 inches of the ground in late winter (March or early April). Older and neglected shrubs can be pruned or trimmed back at this time of year to help reinvigorate new growth. Any diseased, damaged branches or dead wood will be removed at this time as well.

Fall Shrub Trimming / Pruning: Yes some fast growing shrubs can be trimmed lightly and shaped up before winter and snow arrives here in Washington County Maryland.