XL Green Euphorbia Trigona| African Milk Tree| Cathedral Cactus| Tropical Cactus. EUPHORBIA CARE Euphorbias, aka Tropical Cactus are fast growing perennial cactus-like plants that withstand more neglect than almost any other plant. Euphorbia add a wonderful accent to any tropical garden or xeriscape. It is best to wear gloves when handling euphorbias, the milky sap is similar to that of poinsettias & fig trees is a strong irritant, quickly wash off any milky sap that gets on your skin. As with most houseplants, be aware if you have children & pets. in cooler zones a containerized Euphorbia can be relocated indoors for the winter months. xl Green Euphorbia Trigona| African Milk Tree| Cathedral Cactus| High Chaparral , Abyssinian Euphorbia. Tropical Cactus Zone 9