Fertilising guide
How to fertilise Monkey Jack (Artocarpus lakoocha)— schedule & NPK
Also called Monkey Jack, Lakoocha, Monkey Fruit.
More about monkey jack
About Monkey Jack
Artocarpus lakoocha · also called Monkey Jack, Lakoocha · tropical
Monkey Jack is a large deciduous to semi-evergreen tropical tree from South and Southeast Asia, bearing round, rough-skinned fruits consumed raw, cooked, or pickled across its native range. The bark yields oxyresveratrol, studied for pharmacological properties. It is a robust, fast-growing landscape tree requiring full sun, deep soils, and a warm, humid tropical climate.
Growth habit: Large, fast-growing deciduous to semi-deciduous tree with a spreading, irregular canopy
What fertiliser monkey jack actually wants — and why
Monkey Jack 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 monkey jack: 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 monkey jack, 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 monkey jack:
Apply a balanced NPK fertiliser (15-15-15) twice yearly in spring and at the onset of the fruiting season. In organically managed systems, incorporate well-rotted cattle manure or compost as a surface mulch in early spring. Potassium supplementation in the run-up to fruiting improves fruit quality. 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 monkey jack 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 monkey jack
Half strength is the safe default for monkey jack — 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 monkey jack first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the monkey jack watering schedule.
Signs you are over-feeding monkey jack
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for monkey jack:
- 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 monkey jack
- 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 monkey jack care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of monkey jack 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 monkey jack
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 monkey jack — frequently asked questions
What fertiliser does monkey jack 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. Monkey Jack 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 monkey jack?
Apply a balanced NPK fertiliser (15-15-15) twice yearly in spring and at the onset of the fruiting season. In organically managed systems, incorporate well-rotted cattle manure or compost as a surface mulch in early spring. Potassium supplementation in the run-up to fruiting improves fruit quality. Apply a balanced NPK fertiliser (15-15-15) twice yearly in spring and at the onset of the fruiting season. In organically managed systems, incorporate well-rotted cattle manure or compost as a surface mulch in early spring. Potassium supplementation in the run-up to fruiting improves fruit quality. 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 monkey jack?
Half strength is the safe default for monkey jack — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding monkey jack 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 monkey jack 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 monkey jack?
Flush the pot of monkey jack 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
- Monkey Jack care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water monkey jack — 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 titan arum
- How to fertilise bulbifer voodoo lily
- How to fertilise rivieri voodoo lily
- All 8452 fertilising guides in the Growli library