Fertilising guide
How to fertilise Red-fleshed Durian (Durio kutejensis)— schedule & NPK
Also called Red-fleshed Durian, Kalimantan Durian, Pampaken, Durian Merah.
More about red-fleshed durian
About Red-fleshed Durian
Durio kutejensis · also called Red-fleshed Durian, Kalimantan Durian · tropical
Durio kutejensis is a Bornean wild durian prized for its vivid orange-red to salmon-coloured flesh with a caramel-sweet, slightly tangy flavour. A towering rainforest tree, it demands equatorial heat, high humidity, and deep fertile soil. Less commercially widespread than common durian, it is highly sought by tropical-fruit enthusiasts for its distinctive colour and richer flavour profile.
Growth habit: Large, upright tropical tree with a broad, dense canopy; cauliflorous (flowers and fruits emerge directly from the trunk and major branches)
What fertiliser red-fleshed durian actually wants — and why
Red-fleshed Durian 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 red-fleshed durian: 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 red-fleshed durian, 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 red-fleshed durian:
Feed monthly with a high-potassium tropical tree fertiliser (e.g. 12-12-17-2 MgO) during active growth. Apply micronutrient foliar sprays (Boron, Zinc) twice yearly to support flowering. Mulch with decomposed wood chips to maintain soil biology. Treat that as monthly 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 red-fleshed durian 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 red-fleshed durian
Half strength is the safe default for red-fleshed durian — 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 red-fleshed durian first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the red-fleshed durian watering schedule.
Signs you are over-feeding red-fleshed durian
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for red-fleshed durian:
- 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 red-fleshed durian
- 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 red-fleshed durian care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of red-fleshed durian 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 red-fleshed durian
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 red-fleshed durian — frequently asked questions
What fertiliser does red-fleshed durian 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. Red-fleshed Durian 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 red-fleshed durian?
Feed monthly with a high-potassium tropical tree fertiliser (e.g. 12-12-17-2 MgO) during active growth. Apply micronutrient foliar sprays (Boron, Zinc) twice yearly to support flowering. Mulch with decomposed wood chips to maintain soil biology. Feed monthly with a high-potassium tropical tree fertiliser (e.g. 12-12-17-2 MgO) during active growth. Apply micronutrient foliar sprays (Boron, Zinc) twice yearly to support flowering. Mulch with decomposed wood chips to maintain soil biology. Treat that as monthly 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 red-fleshed durian?
Half strength is the safe default for red-fleshed durian — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding red-fleshed durian 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 red-fleshed durian 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 red-fleshed durian?
Flush the pot of red-fleshed durian 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
- Red-fleshed Durian care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water red-fleshed durian — 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 taxiphyllum sp. 'flame'
- How to fertilise taxiphyllum sp. 'spiky'
- How to fertilise vesicularia dubyana
- All 8452 fertilising guides in the Growli library