A long season of bloom can be developed by planting various types of shrubs. The time any shrub remains in bloom varies from a few days to several weeks. The sequence of bloom of several different shrubs remains the same. Use the sequence of bloom to develop a planting with a long blooming period. Weather can shorten the blooming sequence so all shrubs bloom within a shorter time period.
Most landscapes have lots of flowers in spring, few in summer.
Some shrubs bloom on wood produced the current growing season. 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.