Prune forsythia, rhododendron and lilacs for shaping or measurement management after flowering. These crops type buds for subsequent 12 months through the summer time so belated trimming cuts off future buds. You must clip fading flowers although. Deadheading directs progress into blooms versus seeds.
Thinning multi-stemmed shrubs, by eradicating the oldest stems every year, will keep measurement and hold the plant vigorously blooming on new stems. If the shrubs are overgrown, minimize them down to three or four inches for a contemporary begin. A drastic process for drawback crops, this method is known as “rejuvenation.”