Sterilize your pruning shears with a swab of rubbing alcohol and allow them to dry. This can keep you from spreading any diseases between plants when working in the garden.
Select the very tips of the lantana's shoots. Some light shaping may be done at this time, though it's not advised to make deep cuts to lantana in the fall.
Trim the selected tips back very slightly, such as back to the first or second leaf notch, to encourage new blooms. This is the most that should ever be done in the autumn, with heavier pruning reserved for the summer months.
Cut back the lantana completely in January, leaving only 12 inches of dead stem above ground, and cover with 3 inches of pine straw.