Repotting guide

When & how to repot King Palm (Archontophoenix cunninghamiana)

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.

Mature size: Reaches 15-20 m in habitat; in cultivation and containers much smaller, typically 2-5 m, with fronds 2-3 m long. Notably faster than fan palms under good conditions.

Watch for — Yellowing fronds: Usually magnesium or potassium deficiency, common in fast-growing container palms. Use a palm-specific fertiliser and leave green fronds intact while the palm reuses their nutrients.

How to tell king palm needs repotting

Repotting on a calendar is less reliable than reading the plant. For king palm, watch for these signs:

Thick roots out of the drainage holes, or circling the surface and lifting the plant.
The pot dries out unusually fast and king palm wilts between waterings it used to shrug off.
The plant is visibly top-heavy and tips over easily.
Stalled growth and small new leaves over a full season — though with a big specimen, top-dressing is often the better first response before a full repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot king palm

Every 2–3 years; top-dress in the in-between years. King Palm's 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. — sets the pace. 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.

What size pot to step king palm up to

Move up exactly one pot size. A heavy king palm dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot king palm

Early spring, just as new growth restarts, is the ideal window for king palm. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting king palm

Consider top-dressing first. If king palm is not badly root-bound, scrape off and replace the top 3–5 cm of soil instead — far less shock for a big plant that hates moving.
Get help and one size up. For a full repot, choose a pot just one size larger. A heavy plant needs two people and a stable, free-draining pot.
Ease it out on its side. Lay the plant down, slide the pot off, and gently loosen the outer roots. Do not bare-root a mature specimen.
Repot at the same depth. Add fresh rich, moisture-retentive, free-draining mix beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
Water and leave it put. Water thoroughly, then leave king palm in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave king palm in exactly the same spot and light it was in before — moving and repotting at the same time is what makes a big specimen drop leaves. Water it in well, then let the top of the soil dry before watering again so the larger volume of fresh soil does not stay sodden. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for king palm

King Palm wants rich, moisture-retentive, free-draining mix. Use a fertile, humus-rich palm mix with bark and perlite that holds moisture yet drains. Slightly acidic. It thrives in organically rich, evenly moist soil and dislikes both drought and airless waterlogging. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting king palm — frequently asked questions

How often should you repot king palm?

Every 2–3 years; top-dress in the in-between years for king palm. Fully repot king palm only every 2–3 years; in the in-between years just top-dress the top 3–5 cm of soil. Step up one pot size in spring with rich, moisture-retentive, free-draining mix. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does king palm need?

When is the best time of year to repot king palm?

Should you top-dress or fully repot king palm?

For a big, heavy king palm, top-dressing — replacing the top 3–5 cm of soil — is the gentler option most years, with a full repot only every 2–3 years. A mature specimen sulks and drops leaves when fully repotted, so do it as rarely as the roots allow.

Should you fertilise king palm after repotting?

Not immediately. Wait about 4 weeks after repotting king palm. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.