Key Points Prune shrubs based on bloom time, cold tolerance, and variety—check what's best for each type.Cut back new wood ...
Cutting back hydrangeas at the wrong time can affect the next season's blooms. Once new buds form, pruning can result in a hydrangea-free summer.
Wait until fall frost kills tall phlox before pruning to the ground; fall pruning is keeps powdery mildew at bay. Regular deadheading and light trimming encourage bushier growth, extend blooming, and ...