Foliage begonias, which include the Rex, Iron Cross and Angel Wing cultivars, produce colorful leaves and inconspicuous flowers. According to the University of Florida Mid-Florida Research and Education Center, this type of begonia is usually propagated by leaf cuttings. Use a clean, well drained mixture of peat moss and perlite, vermiculite or sand as a potting medium.
Cut the leaves into wedges, with each piece containing a vein and insert the bottom end of the vein into the potting medium. Water thoroughly and cover the container with a plastic bag to maintain humidity. Place the container in a location that receives two hours or more of indirect sunlight each day.
Within two months, roots will form at the base of the cutting and plantlets will form near the vein. After the cutting develops roots, you may transplant it into a new container.
To avoid leaf burn, do not expose the cutting to direct sunlight. Keep the potting medium damp, but do not overwater. Remove cuttings that appear dead or diseased.