Fertilising guide
How to fertilise African Milk Tree (Euphorbia trigona)— schedule & NPK
Also called African milk tree, African milk bush, Cathedral cactus, Candelabra cactus, Friendship cactus, Good luck cactus.
More about african milk tree
About African Milk Tree
Euphorbia trigona · also called African milk tree, African milk bush · houseplant
The African milk tree (Euphorbia trigona) is an upright, candelabra-shaped succulent grown as an easy-care houseplant. Give it bright light, a gritty cactus mix and infrequent watering once the soil dries. It is not pet-safe: its milky latex sap irritates skin, eyes and the gut, so keep it away from pets and children.
Growth habit: Upright, columnar succulent with a candelabra or cathedral-like branching pattern. Three- to four-sided ridged green stems are lined with short paired spines and small teardrop leaves along the ridges; the 'Rubra'/'Royal Red' form flushes burgundy. A vigorous, fast grower that may need staking or repotting as it gains height.
Watch for — Pale, thin, stretched growth (etiolation): A sign of too little light. The stems elongate and lean toward the window. Move to a brighter spot with some direct sun, rotating the plant for even growth, or add a grow light.
What fertiliser african milk tree actually wants — and why
African Milk Tree is a light-feeding succulent — a gentle, low-nitrogen feed a few times in growth keeps it plump without forcing the weak, stretched growth over-feeding causes.
A cactus and succulent formula or a diluted balanced feed with modest, even numbers. Avoid high-nitrogen plant foods — they make a succulent etiolate and grow soft, fracture-prone tissue.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for african milk tree: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed african milk tree, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For african milk tree:
Feed lightly during the growing season (spring through early autumn) with a balanced houseplant or cactus fertiliser diluted to about half strength, roughly once a month. Do not fertilise in autumn and winter when growth slows. Over-feeding produces weak, overly soft growth that is prone to rot and pests. Keep that to once a month between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when african milk tree is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for african milk tree
Quarter to half strength at most for african milk tree. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
Feeding always goes onto already-damp soil, never dry roots — water african milk tree first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the african milk tree watering schedule.
Signs you are over-feeding african milk tree
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for african milk tree:
- Stretched, leggy, pale growth with widely spaced leaves.
- A white salt crust on the soil or around the pot rim.
- Brown, crisped leaf tips and edges.
- Soft, mushy tissue at the base — over-feeding plus damp soil rots it.
Signs you are under-feeding african milk tree
- Uncommon — succulents tolerate lean conditions well.
- Very slow growth and dull, faded colour over a long period.
- Older leaves shed faster than new ones replace them in a tired old mix.
If the symptoms point at watering, light or roots rather than nutrition, the full african milk tree care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of african milk tree until it drains clear, and refresh the gritty mix every 2-3 years.
Organic vs synthetic feeds for african milk tree
Organic options
A heavily diluted seaweed or worm-casting feed once or twice in summer. UK: a drop of Westland seaweed feed; US: quarter-strength Espoma Cactus! or Dr. Earth liquid. Fresh free-draining mix matters more than any feed.
Synthetic / liquid feeds
A dedicated cactus/succulent liquid at quarter to half strength — UK: Baby Bio Cacti & Succulent Drip Feeders or Westland; US: Miracle-Gro Succulent Plant Food or Schultz Cactus Plus.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising african milk tree — frequently asked questions
What fertiliser does african milk tree need?
A cactus and succulent formula or a diluted balanced feed with modest, even numbers. Avoid high-nitrogen plant foods — they make a succulent etiolate and grow soft, fracture-prone tissue. African Milk Tree is a light-feeding succulent — a gentle, low-nitrogen feed a few times in growth keeps it plump without forcing the weak, stretched growth over-feeding causes.
How often should I feed african milk tree?
Feed lightly during the growing season (spring through early autumn) with a balanced houseplant or cactus fertiliser diluted to about half strength, roughly once a month. Do not fertilise in autumn and winter when growth slows. Over-feeding produces weak, overly soft growth that is prone to rot and pests. Feed lightly during the growing season (spring through early autumn) with a balanced houseplant or cactus fertiliser diluted to about half strength, roughly once a month. Do not fertilise in autumn and winter when growth slows. Over-feeding produces weak, overly soft growth that is prone to rot and pests. Keep that to once a month between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
What strength of feed for african milk tree?
Quarter to half strength at most for african milk tree. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
What does over-feeding african milk tree look like?
Stretched, leggy, pale growth with widely spaced leaves. A white salt crust on the soil or around the pot rim. Brown, crisped leaf tips and edges. Soft, mushy tissue at the base — over-feeding plus damp soil rots it. Feeding african milk tree like a leafy houseplant is the classic error — it produces a flush of pale, stretched, floppy growth that never firms up and is prone to rot at the base.
Should I flush the soil of african milk tree?
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of african milk tree until it drains clear, and refresh the gritty mix every 2-3 years.
Keep reading
- African Milk Tree care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water african milk tree — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise snake plant
- How to fertilise dracaena
- How to fertilise peperomia
- All 569 fertilising guides in the Growli library