Euphorbia ingens
Euphorbia ingensUSDA | Grow Zone
9-11Outdoors all year in zones 9 to 11. Anywhere colder, keep it as a houseplant. Protect it below 50°F.
- Light
- Full sun, 6 hours direct
- Water
- When top 2-3 in is dry
- Humidity
- 30-50% humidity
- Temperature
- 65-80°F (18-27°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- Up to 10-15 ft tall
- Pets
- Toxic to cats and dogs
Euphorbia ingens, also known as the African milk barrel, is a striking succulent native to southern Africa. Its unique appearance and resilience make it a popular choice for indoor and outdoor gardens.
Ask Vesper about Euphorbia ingens
Ideal temperature
65-80°F is where it grows fastest. Below 50°F cold damage starts.
Spacing and harvest
- Mature size
- Up to 10-15 ft tall
- Plant apart
- 12-24 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Euphorbia ingens prefers to dry out completely between waterings.
Water thoroughly when the top 2-3 inches of soil feel dry, typically every 2-4 weeks depending on the season. In winter, reduce watering to once a month. Signs of over-watering include yellowing leaves and a mushy stem, while under-watering may cause leaf drop and shriveling.
Light
This plant thrives in full sun and prefers at least 6 hours of direct light daily.
Ideal placement is near a south or west-facing window. It can tolerate partial shade but may grow leggy and less vibrant in lower light conditions.
Soil
Euphorbia ingens prefers a well-draining soil mix, ideally a cactus or succulent potting mix with a pH of 6.0 to 7.0.
Good drainage is essential to prevent root rot, so ensure the pot has drainage holes.
Humidity
This plant prefers low to moderate humidity levels, around 30-50%.
To increase humidity, you can mist the plant occasionally or place a humidity tray nearby. Signs of low humidity stress include browning leaf tips and edges.
Temperature
Euphorbia ingens thrives in temperatures between 65-80°F (18-27°C) and is hardy in USDA zones 9-11.
It can tolerate brief periods of cooler temperatures down to 50°F (10°C) but should be protected from frost.
Fertilizing
Use a balanced, water-soluble fertilizer with an NPK ratio of 10-10-10 during the growing season, every 4-6 weeks.
In fall and winter, reduce or stop fertilizing. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Euphorbia ingens in early spring to maintain its shape and remove any dead or damaged stems.
Use clean, sharp pruning shears and wear gloves, as the sap can be irritating. Deadheading is not necessary for this plant.
Repotting
Repot every 2-3 years or when it becomes root-bound, typically in spring.
Choose a pot 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. Carefully remove the plant, trim any damaged roots, and place it in fresh soil.
Propagation
Propagation can be done through stem cuttings.
Cut a healthy stem, allow it to dry and callous for 1-2 days, then plant it in well-draining soil. Best timing for propagation is in spring or early summer when the plant is actively growing.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or poor drainage.
How to fix it
Allow the soil to dry out completely before watering again, and ensure the pot has adequate drainage.
Browning leaf tips
Why it happens
Low humidity or underwatering.
How to fix it
Increase humidity levels or adjust watering frequency to keep the soil consistently moist but not soggy.
Leggy growth
Why it happens
Insufficient light.
How to fix it
Move the plant to a brighter location with more direct sunlight to encourage compact growth.
Root rot
Why it happens
Over-watering and poor drainage.
How to fix it
Remove the plant from its pot, trim away any rotten roots, and repot in fresh, well-draining soil.
Pests (mealybugs, spider mites)
Why it happens
Dry air and stress.
How to fix it
Inspect regularly and treat infestations with insecticidal soap or neem oil, ensuring to increase humidity.
Care through the year
Spring
In spring, repot if necessary and resume regular watering and fertilizing as the plant begins to grow actively.
Summer
During summer, ensure the plant receives plenty of sunlight and water as needed, allowing the soil to dry out between waterings.
Fall
In fall, gradually reduce watering as the plant enters dormancy. Stop fertilizing and monitor for pests.
Winter
In winter, water less frequently, about once a month, and keep the plant in a warm location away from drafts.
Toxicity & Safety
Euphorbia ingens is toxic to pets (cats and dogs) and humans. The sap can cause skin irritation and ingestion may lead to nausea, vomiting, and diarrhea. Keep out of reach of children and pets.
Good to know
Why are my Euphorbia ingens leaves turning yellow?
Yellow leaves on Euphorbia ingens are often a sign of over-watering or poor drainage. Ensure the soil dries out completely between waterings and check for drainage issues.
How often should I water my Euphorbia ingens?
Water Euphorbia ingens every 2-4 weeks, allowing the top 2-3 inches of soil to dry out completely before watering again. Reduce watering in winter.
What type of soil is best for Euphorbia ingens?
A well-draining cactus or succulent potting mix with a pH of 6.0 to 7.0 is ideal for Euphorbia ingens. Good drainage is crucial to prevent root rot.
Can I propagate Euphorbia ingens from cuttings?
Yes, Euphorbia ingens can be propagated from stem cuttings. Allow the cut end to dry for 1-2 days before planting in well-draining soil.
What temperature does Euphorbia ingens prefer?
Euphorbia ingens thrives in temperatures between 65-80°F (18-27°C) and is hardy in USDA zones 9-11. Protect it from frost.
Is Euphorbia ingens toxic to pets?
Yes, Euphorbia ingens is toxic to pets and humans. Its sap can cause irritation, and ingestion can lead to nausea and vomiting.
How do I prevent pests on my Euphorbia ingens?
To prevent pests, maintain good air circulation and humidity levels. Regularly inspect the plant and treat any infestations promptly with insecticidal soap.
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