Monitor the growing habits of the coleus throughout the growing season. When you notice the coleus stems becoming leggy and stalky, cutting back the coleus helps shape it into a more attractive plant.
Cut back the coleus with the pruning shears, removing the terminal shoots (tips of the stems) back to the first leaf node to encourage lateral branching.
Remove flowers when they appear in middle to late summer to keep the coleus growing attractively. Flowers can divert plant energy and a coleus may stop growing energetically if you allow flowers to fade and seeds to form. Snip off the flowers with the pruning shears, cutting the stems off at the top leaf node.