Making new Umbrella plants is tricky, but it is possible if you take cuttings in the spring or summer during the strongest growth. Cut an entire stem near the base where it meets the soil and dip the last half-inch in rooting hormone. Put it in a pot of peat moss mixed with perlite and cover it with a loose plastic bag to keep humidity high. Keep it in indirect light and warmer than 70 degrees F and give it a few weeks to root. When you see fresh growth on the top of the cutting, you have a new rooted Umbrella plant to repot.