This Euphorbia is striking thanks to its deep red colour. Bright light helps keep the colour at this striking level of vibrancy, and keep the plant happy and growing too. Though not technically a true cactus, it has that striking cactus-like shape with its tall columnar stems and sharp spines. It grows deep red leaves alongside its spikes, too, giving it a truly unusual and eye-catching appearance. Its thick succulent stems hold water, allowing it to survive in the driest environments - including the homes of forgetful gardeners! Keep this plant happy with a spot in direct sun, and not too much water, and it will reward you with growing more of its deep red-and-green foliage. Just watch out for the white sap that gives it the name 'Milk Tree' - it's an irritant to skin so we'd advise handling with gloves and making sure you wash your hands afterwards.
Scientific Name
Euphorbia trigona ‘Rubra’ (Euphorbus' plant with three-angled stems, cultivar: red)
Synonyms: Euphorbia hermentiana
This plant has had its current classification since 1768; as it is a Euphorbia, it isn't technically a cactus, though it has similar needs.
Common Names
Red African Milk Tree, African Milk Plant, Triangular Euphorbia, Royal Red, Cathedral Cactus, Friendship Cactus, Good Luck Cactus
Origin
Native to West Africa, particularly found in seasonally dry tropical regions in Angola, Congo, Gabon, Malawi and Zaire
Light
Prefers bright, indirect sunlight. It can tolerate some direct sunlight, but too much can cause the stems to scorch. Ensure it receives adequate light for vibrant colour and healthy growth.
Water
Allow the soil to dry out completely between waterings. Water thoroughly, ensuring excess water drains away, and reduce watering in the winter months when the plant is dormant.
Humidity
Enjoys low to moderate humidity, just make sure it's not close to an operating radiator or in a very damp space.
Soil
Use a well-draining cactus or succulent potting mix to promote drainage; look for a mix incorporating sand and grit. Repot every three to four years as the plant grows.
Food
Feed every six waters in the growing season; use a fertiliser designed for houseplants or cacti and succulents. Reduce feeding in winter when the plant won't be actively growing.
Temperature
Thrives in warm temperatures from 18-30°C. Protect from temperatures below 12°C, as it is sensitive to frost and cold draughts.
Pet Safe?
No, this plant is mildly toxic if ingested, so keep out of reach of animals and children. Handle with care, as the latex-like sap can be irritating to the skin and eyes.
Sprouts Top Tips
The easiest way to go wrong with this succulent is by giving it too much water; make sure the soil is totally dry before you water again. If the main stem has gone totally brown and squishy, the best course of action will be to take stem cuttings from any healthy part of the plant and propagate them newly.
