Water young lantana plants to keep the soil moist at all times until establishment. Water the mature lantana with 1 inch of water once a week.
Fertilize the shrub with 10-10-10 fertilizer in early spring as soon as you notice new growth. Always water after applying fertilizer.
Top dress the soil with a 3-inch layer of mulch. Spread it on the soil from 3 inches away from the plant's base to its widest point. Pine needle mulch provides the acidity lantanas prefer.
Pinch 1/2 of new stem tips periodically throughout the season to encourage the lantana to grow bushier.
Prune the lantana in spring by removing old stems. Cut it to within 3 to 6 inches of the soil.