Easily grown shrubs are usually planted in the perennial garden because of the abundance of colorful flowers. Too much or too little water or over fertilization will cause buds to drop from this plant. This plant is capable of self-sowing to the point of being a nuisance if the soil beneath is suitable for germinating. Flowers are produced on new growth so prune in late winter if you wish to control its size. Pruning is not necessary for flower production. Shrubs are easy to transplant bare root or balled and burlapped. Plants in flower attract hummingbirds.