Euphorbia trigona is a perennial plant, up to 9 feet (2.7 m) tall. It has an upright stem that is branched into three or four sides. The stem itself is dark green with V-shaped light green patterns. The up to 0.2 inch (5 mm) long thorns are placed in pairs of two on the stem’s ridges. The drop shaped leafs grows from between the two thorns on each ridge. The plant’s flowers are white or a combination of white and light yellow. The flowers appear on spring and summer, but potted versions of the plant may not grow flowers at all.