Euphorbia trigona is a succulent euphorbia grown for its decorative stems. It should not be rooted in water or it will rot. To propagate this plant, you can take a stem cutting in late spring or early summer.

Protect your skin and eyes when making cuttings, as the sap can cause irritation or an allergic reaction to some people. Stopping the flow of milky sap is important to the health of the parent plant and the cutting. Dip the cutting end in water and spray the parent's wound with water. Then let the cutting dry out ("heal") for a few days to avoid disease. Prepare a pot of moistened peat moss based potting mixture, with added perlite for better drainage, and a layer of horticultural sand or vermiculite on top to prevent rot. Insert your cutting into the potting mix and place it in filtered light at normal room temperature.

Keep the potting mixture just barely moist for about two months. At that point roots will have formed and new growth will appear on the cutting. You can repot the plant in succulent potting mixture and treat the plant as a mature euphorbia.

Good luck with your propagation!

For tips on a variety of gardening topics, see our Plant Information Guides.

Courtesy of NYBG Plant Information Service