Texas Cooperative Extension,
This allows for vigorous summertime growth and results in plenty of flower buds the following year. Some examples of shrubs that bloom on last seasons's growth are:
Some shrubs that bloom after June usually do so from buds which are formed on shoots that grow the same spring. These shrubs should be pruned in late winter to promote vigorous shoot growth in spring. Examples of shrubs that bloom on current season's growth include:
For complete information on pruning shrubs, consult our website: www//aggie.horticulture.tamu.edu
Texas A&M University, College Station, TexasMarch 2005
When to Prune Flowering Shrubs
by Dr. Douglas F. Welsh, Extension Horticulturist,
Texas Cooperative Extension
Cassias need only light pruning
If a shrub is grown for its flowers, time the pruning to minimize disruption of blooming. Spring-flowering shrubs bloom on last season's growth and should be pruned soon after they bloom.