Monadenium (Monadenium ritchiei)

Also called Euphorbia ritchiei, this rare succulent from Kenya makes an attractive plant for warm, dry environments. It has a columnar shape with small, rounded protrusions on the stem, called tubercles, that are arranged in spirals. Leaves form during the active growing season but they drop off as the seasons change. Pink flowers, called cyathia, appear on the stem tips in late summer and fall. It spreads by underground shoots and eventually forms a large clump. The stems blush red in full sun. Make sure to grow in a well-drained cactus soil in a clay pot, and water only when the soil is dry.