Mature size & growth rate

How big does King Palm (Archontophoenix cunninghamiana) get?

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.

Indoor size vs how big it gets in the wild

King Palm is a tree at heart. Indoors a pot and your ceiling keep it to reaches 15-20 m in habitat, but in the ground it is a different scale of plant entirely (in cultivation and containers much smaller, typically 2-5 m, with fronds 2-3 m long. notably faster than fan palms under good conditions.). Indoors and in a pot, expect reaches 15-20 m in habitat. In the ground with no restriction it is a completely different plant — in cultivation and containers much smaller, typically 2-5 m, with fronds 2-3 m long. notably faster than fan palms under good conditions. — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Growth rate and years to mature

King Palm is a fast grower. Realistically, expect two to four years from a young plant to a room-filling specimen in good light. Its feeding profile backs this up: 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.

Want this turned into the right next pot at the right moment? The pot size calculator and the king palm repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast king palm grows.

How to keep king palm smaller

You are not stuck with the maximum size. For king palm specifically, these are the levers, in order of impact:

The decisive tool is the secateurs: king palm can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape.
Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size.
Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height.
Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

The keep-it-smaller method, step by step

Pick the new height. Decide how tall you want king palm and find a leaf node or branch point just below that.
Top the main stem. Cut the main growing tip cleanly just above that node in spring; this permanently caps the height and forces side branches.
Keep the pot snug. Avoid jumping to a much bigger pot — a slightly restricted rootball keeps the whole plant smaller.
Maintain the shape. Prune back the tallest new leaders each spring to hold it at the height you chose.

How to grow king palm bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for king palm the accelerators are:

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators.
Pot up a size every year or two while young; restricted roots are the main thing holding height back.
Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.

Light is almost always the ceiling. The king palm light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When king palm outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for king palm:

The top leaves pressing against or bent by the ceiling — the classic "this is now too tall indoors" sign.
It has to be moved away from a light source it has literally outgrown.
Roots filling the largest pot you can reasonably keep indoors — at that point it is top-or-prune or move it outside (if hardy).

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the king palm repotting guide. If you want more of this plant instead of a bigger one, the king palm propagation guide turns prunings into new plants.

King Palm size — frequently asked questions

How big does king palm get?

King Palm reaches reaches 15-20 m in habitat when grown indoors, and far larger where it grows unrestricted (in cultivation and containers much smaller, typically 2-5 m, with fronds 2-3 m long. notably faster than fan palms under good conditions.). It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Is king palm slow or fast growing?

King Palm is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. King Palm is a tree at heart. Indoors a pot and your ceiling keep it to reaches 15-20 m in habitat, but in the ground it is a different scale of plant entirely (in cultivation and containers much smaller, typically 2-5 m, with fronds 2-3 m long. notably faster than fan palms under good conditions.).

How long does king palm take to reach full size?

Roughly two to four years from a young plant to a room-filling specimen in good light. Light, pot size and feeding move that timeline more than anything else.

How do I keep king palm smaller?

The decisive tool is the secateurs: king palm can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape. Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size. Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height. Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

How can I make king palm grow bigger or faster?

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators. Pot up a size every year or two while young; restricted roots are the main thing holding height back. Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.