Fertilising guide
How to fertilise Cacao (Theobroma cacao)— schedule & NPK
Also called Cacao, Cocoa tree, Chocolate tree.
More about cacao
About Cacao
Theobroma cacao · also called Cacao, Cocoa tree · tropical
Cacao is a small understorey rainforest tree, the source of chocolate, bearing large pods directly on its trunk. It demands deep shade when young, constant warmth, very high humidity and rich, moist, well-drained soil. Strictly frost-tender, it makes an exacting greenhouse or houseplant. All parts contain theobromine, toxic to pets.
Growth habit: Small, slender evergreen tree with tiered branches and large, glossy, drooping leaves that flush bronze-red when new. Flowers and large ridged pods are borne directly on the trunk and main branches (cauliflory).
Watch for — Leaf scorch in direct sun: As an understorey tree, full sun bleaches and burns the leaves; provide bright filtered light or light shade.
What fertiliser cacao actually wants — and why
Cacao is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom 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 cacao: 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 cacao, 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 cacao:
Feed regularly in active growth with a balanced fertiliser every 3-4 weeks spring to autumn, supplemented with organic matter; cacao responds to rich feeding but is sensitive to fertiliser salt build-up, so keep doses moderate and flush pots occasionally. Reduce in winter. For a fast grower like this that means feeding regularly — about every 3-4 weeks — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
The dormant-season rule matters more than the exact interval: skip feeding entirely when cacao 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 cacao
Half strength every feed is the sweet spot for cacao: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
Feeding always goes onto already-damp soil, never dry roots — water cacao first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the cacao watering schedule.
Signs you are over-feeding cacao
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for cacao:
- Brown, scorched leaf tips and margins despite correct watering.
- A white salt crust on the soil or around the pot edge.
- Sudden leaf yellowing and drop shortly after a strong feed.
- Soft, weak, over-stretched growth that cannot support itself.
Signs you are under-feeding cacao
- New leaves coming in noticeably smaller than older ones.
- Pale, yellow-green older leaves and slow growth through peak summer.
- A general loss of vigour and gloss in a plant that should be racing away.
If the symptoms point at watering, light or roots rather than nutrition, the full cacao care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Because you feed often, salts accumulate faster — flush the pot of cacao with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Organic vs synthetic feeds for cacao
Organic options
A diluted seaweed or fish-and-seaweed feed plus a yearly top-dress of worm castings supports fast growth without burn risk. UK: Westland seaweed or Baby Bio Organic; US: Neptune's Harvest or Espoma Indoor!.
Synthetic / liquid feeds
A balanced houseplant liquid at half strength applied frequently — UK: Baby Bio, Phostrogen or Westland Houseplant Feed; US: Miracle-Gro Indoor Plant Food or Dyna-Gro Foliage-Pro for steady leafy growth.
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 cacao — frequently asked questions
What fertiliser does cacao need?
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom formula. Cacao is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
How often should I feed cacao?
Feed regularly in active growth with a balanced fertiliser every 3-4 weeks spring to autumn, supplemented with organic matter; cacao responds to rich feeding but is sensitive to fertiliser salt build-up, so keep doses moderate and flush pots occasionally. Reduce in winter. Feed regularly in active growth with a balanced fertiliser every 3-4 weeks spring to autumn, supplemented with organic matter; cacao responds to rich feeding but is sensitive to fertiliser salt build-up, so keep doses moderate and flush pots occasionally. Reduce in winter. For a fast grower like this that means feeding regularly — about every 3-4 weeks — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
What strength of feed for cacao?
Half strength every feed is the sweet spot for cacao: frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
What does over-feeding cacao look like?
Brown, scorched leaf tips and margins despite correct watering. A white salt crust on the soil or around the pot edge. Sudden leaf yellowing and drop shortly after a strong feed. Soft, weak, over-stretched growth that cannot support itself. The mistake here is the opposite of most houseplants: under-feeding a fast tropical in peak season starves it, leaving small, pale new leaves and slow growth — but full-strength doses still burn it, so feed often and weak, not occasionally and strong.
Should I flush the soil of cacao?
Because you feed often, salts accumulate faster — flush the pot of cacao with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Keep reading
- Cacao care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water cacao — 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 monstera
- How to fertilise pothos
- How to fertilise fiddle leaf fig
- All 5561 fertilising guides in the Growli library