Grasp the stem of the coleus between your thumb and forefinger, directly above the topmost or second from the top set of leaves. Press your fingernail against your thumb, pinching the stem off the plant at this spot.
Pinch the coleus when the plants are 6 to 8 inches tall. Repeat pinching every three to four weeks throughout the growing season.
Inspect the coleus for flower buds during the flowering period for the specific coleus variety. Coleus typically flower from midsummer into fall, depending on the variety.
Pinch off the flower buds as they form to prevent the plant from blooming. Once a coleus blooms, the plant declines and dies back. Pinching prevents flower formation and extends the life of the plants.