Shrubs planted in rich soil seldom need fertilizing. Shrubs growing in shade, however, may be competing for nutrients with established trees or other plants. These shrubs require annual fertilizing, preferably in late winter or early spring. Also, you may want to use fertilizers if your shrubs show signs that the soil is not adequate for their specific needs. Signs of low soil fertility are small pale leaves and short twig growth.
Most shrubs grow well without pruning.
You may want to prune to remove dead branches, to shape plants, or to reduce their size. Shrubs that bloom in early spring should be pruned after they flower. Summer-flowering types and those grown for foliage alone should be pruned in early spring. Make pruning cuts back to a bud or a larger branch. Insects and Diseases Most garden supply stores sell general purpose insecticides that aid in controlling insects and diseases.