Fertilising guide
How to fertilise Coral Plant (Jatropha multifida)— schedule & NPK
Also called Coral Plant, Coral Bush, Physic Nut, Guatemala Rhubarb.
More about coral plant
About Coral Plant
Jatropha multifida · also called Coral Plant, Coral Bush · tropical
Coral Plant is a fast-growing tropical shrub from Mexico with deeply dissected, fan-like leaves that create a lush, almost tree-fern appearance. Above them rise flat-topped clusters of brilliant coral-red flowers on tall, branching stalks — blooming almost year-round in warm climates. It thrives in full sun and is popular in frost-free landscapes and large containers.
Growth habit: Fast-growing, multi-stemmed tropical shrub with a slender trunk and large, deeply dissected, palmate leaves (up to 30 cm across) with 7–11 narrow lobes, giving a tree-fern-like appearance. Produces branched, flat-topped corymbs of vivid coral-red flowers held above the canopy on long peduncles. Explosive seed capsules fling seeds several metres when ripe.
Watch for — Spider mites in dry conditions: Underside feeding by spider mites causes stippled, yellowing foliage, particularly in warm, dry indoor environments. Treat with neem oil or insecticidal soap spray; improve humidity and air circulation.
What fertiliser coral plant actually wants — and why
Coral Plant is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 coral plant: 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 coral plant, 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 coral plant:
Feed every 2–4 weeks during the growing season with a balanced liquid fertilizer (e.g., 10-10-10) diluted to half strength. A slightly higher potassium formulation supports flower production. Cease feeding in winter or when growth slows. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when coral plant 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 coral plant
Half strength is the safe default for coral plant — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water coral plant first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the coral plant watering schedule.
Signs you are over-feeding coral plant
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for coral plant:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding coral plant
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full coral plant care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of coral plant with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for coral plant
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 coral plant — frequently asked questions
What fertiliser does coral plant need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Coral Plant is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed coral plant?
Feed every 2–4 weeks during the growing season with a balanced liquid fertilizer (e.g., 10-10-10) diluted to half strength. A slightly higher potassium formulation supports flower production. Cease feeding in winter or when growth slows. Feed every 2–4 weeks during the growing season with a balanced liquid fertilizer (e.g., 10-10-10) diluted to half strength. A slightly higher potassium formulation supports flower production. Cease feeding in winter or when growth slows. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for coral plant?
Half strength is the safe default for coral plant — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding coral plant look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding coral plant year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of coral plant?
Flush the pot of coral plant with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Coral Plant care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water coral plant — 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 apricot gongora
- How to fertilise truncated gongora
- How to fertilise helmet-shaped gongora
- All 8452 fertilising guides in the Growli library