Oct 25, Fall is the time for the most severe pruning of spirea. With sharp shears, cut each stem back to about 8 inches (20 cm.) from the ground.
Don’t worry that the plant won’t bounce back. In the spring, spirea will reward you’re courageous pruning with new stems and plenty of blossoms. Mar 02, Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. This removes the dead blossoms and also may trigger a second blooming and new leaf growth.
You can also shape the shrub at this time. More drastically cutting back spirea should occur in the fall or in late winter to early spring. Jun 23, Understands that pruning after flowering is a practice that is carried out to give the bush as much time as possible for new buds before the next flowering. As I said, cutting the spire generates wounds, but that should not scare shrubhauling.buzzted Reading Time: 9 mins. Nov 23, Spireas flower in spring or summer, depending on the species and cultivar, so pruning time varies according to the bloom time.
Prune spring-flowering shrubs immediately after the flowers.