Fertilising guide
How to fertilise Gamboge Tree (Garcinia xanthochymus)— schedule & NPK
Also called Gamboge Tree, Mysore Gamboge, False Mangosteen, Himalayan Garcinia.
More about gamboge tree
About Gamboge Tree
Garcinia xanthochymus · also called Gamboge Tree, Mysore Gamboge · tropical
Gamboge Tree is a handsome, slow-growing evergreen from the Indian subcontinent with large glossy drooping leaves and attractive yellow-skinned, juicy fruits. Tolerant of shade and a wide range of soils, it is one of the more adaptable Garcinias. It suits large containers and warm conservatories, fruiting after 7–8 years from seed.
Growth habit: Evergreen tree with a dense pyramidal crown and large, glossy, pendulous leaves. Very slow-growing; seedlings take 7–8 years to fruit. Mature trees are ornamentally striking even outside fruit season.
Watch for — Iron and zinc deficiency: In alkaline or calcareous soils, yellowing (chlorosis) between leaf veins indicates micronutrient deficiency. Apply chelated iron and zinc foliar spray and adjust soil pH toward 6.0–6.5.
What fertiliser gamboge tree actually wants — and why
Gamboge Tree 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 gamboge 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 gamboge 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 gamboge tree:
Fertilise sparingly three times per year with a slow-release balanced formula, applied 25 cm away from the base. Excessive feeding promotes leafy growth at the expense of fruiting. Organic mulch or compost dressing annually is beneficial. 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 gamboge 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 gamboge tree
Half strength is the safe default for gamboge tree — 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 gamboge tree first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the gamboge tree watering schedule.
Signs you are over-feeding gamboge tree
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for gamboge tree:
- 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 gamboge tree
- 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 gamboge tree care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of gamboge tree 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 gamboge tree
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 gamboge tree — frequently asked questions
What fertiliser does gamboge tree 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. Gamboge Tree 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 gamboge tree?
Fertilise sparingly three times per year with a slow-release balanced formula, applied 25 cm away from the base. Excessive feeding promotes leafy growth at the expense of fruiting. Organic mulch or compost dressing annually is beneficial. Fertilise sparingly three times per year with a slow-release balanced formula, applied 25 cm away from the base. Excessive feeding promotes leafy growth at the expense of fruiting. Organic mulch or compost dressing annually is beneficial. 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 gamboge tree?
Half strength is the safe default for gamboge tree — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding gamboge tree 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 gamboge tree 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 gamboge tree?
Flush the pot of gamboge tree 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
- Gamboge Tree care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water gamboge 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 white knight philodendron
- How to fertilise white princess philodendron
- How to fertilise white wizard philodendron
- All 8452 fertilising guides in the Growli library