Euphorbia Milii Crown Of Thorns Red Cactus Cacti Succulent Live Plant in 4" Pot. Euphorbia Milii is an attractive shrub with its origin in Madagascar. Growing up to 6 feet in height, the plant can be grown without giving much attention. This succulent plant from the Euphorbiaceae family enters into dormancy in the winter months. Euphorbia Milii is known by its common names “Crown of Thorns” and “Christ Plant”. Euphorbia Milii is a slow-growing exotic plant. Christ Plant blooms in delicate gold red color throughout the spring. The flowers of these plants add an ornamental look to any room. These succulents do not prefer moist soils. Water during their growing season and then let the soil dry out between watering. Euphorbia Milii grows best in soil-based potting mix. Acidic soil also helps in the plant’s growth and well-being. This popular houseplant belongs to the hardiness zone of 9b to 11b. As this variety is not frost tolerant, plant it indoors if you live in areas with freezing temperatures of 35 F (2 C). Crown of Thorns enjoy full sun. They should be kept in a sunny location during the growing season. This unusual indoor plant can be propagated from cuttings. Euphorbia Milii “Crown of Thorns” succulent is low-maintenance and can be easily available. Perfect for enhancing your garden’s beauty.