Euphorbia heptagona resembles E. atrispina and E. enopla var. enopla, but E. heptagona has less spines on the stems that are thicker and have more angles, and the stem is a light green. We previously offered this plant as E. enopla. This species can grow outside in Tucson and has taken the mid-20s F without damage in our shadehouse. We offer rooted cuttings of this species in 5-inch pots.