Pruning is a necessary practice for most plant materials. Proper pruning is very important to plant growth. In order to prune plants properly you must know what plant you are pruning, its growth habit and it’s flowering time. Flowering Shrubs that bloom before June 1, must NOT be pruned in the spring. These plants such as forsythia, magnolia, wisteria, rhododendron, azalea, lilac, bridalwreath spiraea, redbud and flowering dogwood must be pruned after they are finished