The other type of shrub forms a shoot in the spring, lengthens it in summer, then form flower buds during the fall. The flower buds are carried through winter and opened in the spring. A summer flowering shrub blooming on current year's wood, produce more new growth if pruned in early spring. More new growth should give more flowers. A spring blooming shrub is pruned right after the flowering.
Cold temperatures can kill flower buds carried through the winter.
A shrub fertilized heavily with nitrogen may not flower well. Nitrogen promotes the formation of leaves and branches but not flowers. There is a sequence of fruiting just as there is a sequence of blooming. The fruiting sequence is not the same as the blooming sequence and may be disrupted by birds feeding on the fruit. Shrubs with showy flowers may have insignificant or non-ornamental fruit.