Fertilising guide
How to fertilise King Palm (Archontophoenix cunninghamiana)— schedule & NPK
Also called king palm, bangalow palm, piccabeen palm.
More about king palm
About King Palm
Archontophoenix cunninghamiana · also called king palm, bangalow palm · tropical
Archontophoenix cunninghamiana, the king or bangalow palm, is a fast, elegant feather palm from eastern Australian rainforests. It has a smooth ringed trunk, a green crownshaft and a graceful crown of arching pinnate fronds, with showy lilac flowers and red fruit. It likes warmth, moisture and bright filtered light and is considered non-toxic to pets.
Growth habit: Solitary, fast-growing evergreen feather palm with a slim, smooth, ringed grey trunk, a distinct green crownshaft and a crown of long, arching pinnate fronds. Pendulous sprays of lilac flowers give way to red fruit on mature plants. Self-cleaning fronds.
Watch for — Browning frond tips: The most frequent complaint, caused by dry air, under-watering or salt/fluoride in tap water. Keep soil evenly moist, raise humidity, and water with low-mineral water.
What fertiliser king palm actually wants — and why
King 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 king 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 king 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 king palm:
A fast grower that benefits from regular feeding: apply a palm fertiliser with magnesium, potassium and micronutrients every 4-6 weeks in spring and summer. This prevents the frond yellowing palms are prone to. Reduce in autumn and stop over winter. 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 king 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 king palm
Half strength is the safe default for king 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 king palm first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the king palm watering schedule.
Signs you are over-feeding king palm
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for king palm:
- 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 king palm
- 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 king palm care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of king 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 king 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 king palm — frequently asked questions
What fertiliser does king 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. King 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 king palm?
A fast grower that benefits from regular feeding: apply a palm fertiliser with magnesium, potassium and micronutrients every 4-6 weeks in spring and summer. This prevents the frond yellowing palms are prone to. Reduce in autumn and stop over winter. A fast grower that benefits from regular feeding: apply a palm fertiliser with magnesium, potassium and micronutrients every 4-6 weeks in spring and summer. This prevents the frond yellowing palms are prone to. Reduce in autumn and stop over winter. 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 king palm?
Half strength is the safe default for king palm — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding king 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 king 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 king palm?
Flush the pot of king 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.
Keep reading
- King Palm care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water king palm — 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 3899 fertilising guides in the Growli library