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Fertilising guide

How to fertilise Stilt Palm (Iriartea deltoidea)— schedule & NPK

Also called Bombona Palm, Walking Palm, Huacrapona.

More about stilt palm

About Stilt Palm

Iriartea deltoidea · also called Bombona Palm, Walking Palm · tropical

A dominant canopy palm of Amazonian and Andean foothill rainforests, recognisable by its extraordinary stilt-like aerial root system that elevates the trunk above the forest floor. Pinnate fronds arch dramatically. Rarely cultivated outside specialist botanical gardens or large tropical estates. Non-toxic to pets.

Growth habit: Single-trunked tall pinnate palm with prominent aerial stilt roots

What fertiliser stilt palm actually wants — and why

Stilt Palm 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 stilt palm: 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 stilt palm, 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 stilt palm:

Apply a balanced slow-release palm fertiliser in spring and midsummer. This large, vigorous palm in the ground benefits from supplemental organic mulching with leaf mould or composted bark around the stilt root zone. 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 stilt palm 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 stilt palm

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

Signs you are over-feeding stilt palm

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

Signs you are under-feeding stilt palm

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

Flushing and leaching the salts

Flush the pot of stilt palm 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 stilt palm

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 stilt palm — frequently asked questions

What fertiliser does stilt palm 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. Stilt Palm 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 stilt palm?

Apply a balanced slow-release palm fertiliser in spring and midsummer. This large, vigorous palm in the ground benefits from supplemental organic mulching with leaf mould or composted bark around the stilt root zone. Apply a balanced slow-release palm fertiliser in spring and midsummer. This large, vigorous palm in the ground benefits from supplemental organic mulching with leaf mould or composted bark around the stilt root zone. 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 stilt palm?

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

What does over-feeding stilt palm 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 stilt palm 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 stilt palm?

Flush the pot of stilt palm 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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