Crown of Thorns (Euphorbia milii): Spiny Succulent with Year-Round Blooms

Crown of thorns (Euphorbia milii), also called Christ plant or Siamese lucky plant, is a spiny, succulent shrub that blooms almost continuously with colorful bracts (modified leaves) in red, pink, yellow, or white surrounding tiny true flowers. The thick, gray stems are armed with sharp, half-inch spines.

Features

Grows 2–3 feet tall (up to 6 feet in tropics). The bright green, obovate leaves appear on new growth but drop under stress. The milky sap is irritating and toxic. Many cultivars offer a range of bract colors and sizes.

Culture

Full sun; extremely well-drained soil (cactus mix). Water deeply but allow to dry completely. Drought-tolerant. Minimum temperature 50°F. Prune carefully (wear gloves). Excellent container plant.

Taxonomy

• Family: Euphorbiaceae
• Genus: Euphorbia
• Species: milii
• Synonym: Euphorbia splendens var. milii