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Fertilising guide

How to fertilise Triangle Fig (Ficus triangularis)— schedule & NPK

Also called triangle fig, triangle-leaf fig.

More about triangle fig

About Triangle Fig

Ficus triangularis · also called triangle fig, triangle-leaf fig · tropical

The triangle fig is a compact, slow-growing Ficus with distinctive thick, glossy triangular leaves, often sold in a variegated cream-edged form. It is more tolerant and less drop-prone than the fiddle-leaf fig, making a tidy, sculptural houseplant that wants bright indirect light, even watering once the topsoil dries, warmth, and protection from cold drafts.

Growth habit: Compact, slow-growing shrubby fig with a naturally bushy, well-branched habit and stiff, leathery triangular leaves. Stays smaller and tidier than tree-type figs, making it suited to shelves and tabletops; tolerates pruning to shape.

What fertiliser triangle fig actually wants — and why

Triangle Fig 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 triangle fig: 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 triangle fig, 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 triangle fig:

Feed every 2-4 weeks during spring and summer with a balanced liquid houseplant fertiliser at half strength; stop feeding in autumn and winter when growth is minimal. Treat that as every 2-4 weeks 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 triangle fig 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 triangle fig

Half strength is the safe default for triangle fig — 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 triangle fig first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the triangle fig watering schedule.

Signs you are over-feeding triangle fig

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for triangle fig:

Signs you are under-feeding triangle fig

If the symptoms point at watering, light or roots rather than nutrition, the full triangle fig care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of triangle fig 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 triangle fig

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 triangle fig — frequently asked questions

What fertiliser does triangle fig 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. Triangle Fig 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 triangle fig?

Feed every 2-4 weeks during spring and summer with a balanced liquid houseplant fertiliser at half strength; stop feeding in autumn and winter when growth is minimal. Feed every 2-4 weeks during spring and summer with a balanced liquid houseplant fertiliser at half strength; stop feeding in autumn and winter when growth is minimal. Treat that as every 2-4 weeks 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 triangle fig?

Half strength is the safe default for triangle fig — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding triangle fig 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 triangle fig 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 triangle fig?

Flush the pot of triangle fig 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.

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