Fertilising guide
How to fertilise Bignay (Antidesma bunius)— schedule & NPK
Also called Bignay, Chinese laurel, Currant tree.
More about bignay
About Bignay
Antidesma bunius · also called Bignay, Chinese laurel · tropical
Bignay is a tropical evergreen tree grown for clusters of small currant-like fruit that ripen from green through red to black, used in jams, wine and juice. It needs warmth, full sun and well-drained soil, and is frost-tender. Plants are typically dioecious, so a male is needed to pollinate fruiting females. Fast-growing and ornamental, with glossy foliage.
Growth habit: Upright, fast-growing evergreen tree with a dense rounded crown, glossy leathery leaves and long drooping strings of small berries; usually dioecious, needing both sexes for fruit.
Watch for — No fruit on a lone tree: Bignay is usually dioecious, so a solitary female sets no fruit without a nearby male; plant both sexes or a known self-fertile clone.
What fertiliser bignay actually wants — and why
Bignay 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 bignay: 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 bignay, 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 bignay:
Feed monthly through the growing season with a balanced fruit-tree fertiliser, increasing potassium during fruiting; young trees respond well to nitrogen for fast establishment. Use a slow-release granular feed in spring as a base and taper off in autumn. 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 bignay 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 bignay
Half strength is the safe default for bignay — 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 bignay first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the bignay watering schedule.
Signs you are over-feeding bignay
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for bignay:
- 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 bignay
- 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 bignay care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of bignay 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 bignay
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 bignay — frequently asked questions
What fertiliser does bignay 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. Bignay 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 bignay?
Feed monthly through the growing season with a balanced fruit-tree fertiliser, increasing potassium during fruiting; young trees respond well to nitrogen for fast establishment. Use a slow-release granular feed in spring as a base and taper off in autumn. Feed monthly through the growing season with a balanced fruit-tree fertiliser, increasing potassium during fruiting; young trees respond well to nitrogen for fast establishment. Use a slow-release granular feed in spring as a base and taper off in autumn. 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 bignay?
Half strength is the safe default for bignay — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding bignay 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 bignay 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 bignay?
Flush the pot of bignay 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
- Bignay care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water bignay — 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