euphorbia trigona (also known as african milk tree, cathedral cactus), cactus as a decorative plant

african milk tree america botanic botanical botany cactus thorn cathedral central closeup color costa rica decoration decorative euphorbia trigona exotic flora flower fresh garden green home house plant leaf leaves natural nature species texture thorns erect stem branches grow two three sides dark light v-shaped patterns 1⁄4 inch spines found pairs crests drop-shaped ridge sides patterns stem ridge