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Fertilising guide

How to fertilise Weeping fig (Ficus benjamina)— schedule & NPK

Also called benjamin fig, benjamina, ficus tree.

About Weeping fig

Ficus benjamina · also called benjamin fig, benjamina · houseplant

Weeping fig is a popular indoor tree from south and southeast Asia with small glossy leaves on arching branches. It is famously sensitive to change — moves, drafts, and inconsistent watering all trigger dramatic leaf drop. Mildly toxic to pets, and the milky sap can cause skin irritation.

The weeping fig (Ficus benjamina, family Moraceae) is a popular indoor tree. Per the ASPCA it is toxic to dogs, cats and horses; its milky latex contains ficin (a proteolytic enzyme) and psoralen (ficusin), causing gastrointestinal upset and skin/dermal irritation.

Apply a houseplant fertilizer about twice monthly during active growth; ease off in winter when growth slows.

Growth habit: Evergreen tree, often sold as a single trunk or braided

Sources: aspca.org, missouribotanicalgarden.org, rhs.org.uk

What fertiliser weeping fig actually wants — and why

Weeping 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 weeping 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 weeping 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 weeping fig:

Half-strength balanced feed every 4-6 weeks during the growing season. Treat that as every 4-6 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 weeping 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 weeping fig

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

Signs you are over-feeding weeping fig

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

Signs you are under-feeding weeping fig

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

Flushing and leaching the salts

Flush the pot of weeping 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 weeping 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 weeping fig — frequently asked questions

What fertiliser does weeping 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. Weeping 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 weeping fig?

Half-strength balanced feed every 4-6 weeks during the growing season. Half-strength balanced feed every 4-6 weeks during the growing season. Treat that as every 4-6 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 weeping fig?

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

What does over-feeding weeping 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 weeping 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 weeping fig?

Flush the pot of weeping 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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