Cut the bush to the desired size every three to five weeks during the summer growing season. Cut back all the branches by approximately 6 inches with pruning shears. Frequent pruning encourages compact growth and abundant flowering.
Prune back the lantana by half its height and width if it becomes too large for its location. Cut back severely in midsummer to control size.
Apply a low-nitrogen fertilizer after pruning at one-fourth the rate recommended on the fertilizer package. Water immediately after fertilizing. Water and light feeding encourages the newly pruned shrub to put on new, healthy growth.
Trim down perennial lantana in late winter or early spring before new growth begins. Cut the entire shrub down to a 6- to 12-inch height. The bush sends up new shoots in spring to replace those pruned.