Mature size & growth rate

How big does Paulownia tomentosa (Paulownia tomentosa) get?

Also called Foxglove Tree, Empress Tree, Princess Tree.

More about paulownia tomentosa

About Paulownia tomentosa

Paulownia tomentosa · also called Foxglove Tree, Empress Tree · flowering

An extremely fast-growing tree prized for enormous, fuzzy heart-shaped leaves and upright panicles of fragrant, foxglove-like lilac flowers that open before the foliage in spring. Often pollarded for giant decorative leaves. Note it is highly invasive in parts of North America, so check local guidance before planting.

Mature size: Around 8-15 m tall and 8-12 m wide if left unpruned; pollarded plants are kept to 2-4 m as foliage features.

Indoor size vs how big it gets in the wild

Paulownia tomentosa is a tree at heart. Indoors a pot and your ceiling keep it to around 8-15 m tall and 8-12 m wide if left unpruned, but in the ground it is a different scale of plant entirely (pollarded plants are kept to 2-4 m as foliage features.). Indoors and in a pot, expect around 8-15 m tall and 8-12 m wide if left unpruned. In the ground with no restriction it is a completely different plant — pollarded plants are kept to 2-4 m as foliage features. — 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

Paulownia tomentosa 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: vigorous and rarely needs feeding in good soil. for pollarded specimens grown for foliage, a spring application of balanced or nitrogen-rich fertiliser fuels the large leaves. mulch annually with compost.

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

How to keep paulownia tomentosa smaller

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

The decisive tool is the secateurs: paulownia tomentosa 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 paulownia tomentosa 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 paulownia tomentosa bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for paulownia tomentosa 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 paulownia tomentosa light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When paulownia tomentosa outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for paulownia tomentosa:

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 paulownia tomentosa repotting guide. If you want more of this plant instead of a bigger one, the paulownia tomentosa propagation guide turns prunings into new plants.

Paulownia tomentosa size — frequently asked questions

How big does paulownia tomentosa get?

Paulownia tomentosa reaches around 8-15 m tall and 8-12 m wide if left unpruned when grown indoors, and far larger where it grows unrestricted (pollarded plants are kept to 2-4 m as foliage features.). 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 paulownia tomentosa slow or fast growing?

Paulownia tomentosa is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Paulownia tomentosa is a tree at heart. Indoors a pot and your ceiling keep it to around 8-15 m tall and 8-12 m wide if left unpruned, but in the ground it is a different scale of plant entirely (pollarded plants are kept to 2-4 m as foliage features.).

How long does paulownia tomentosa 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 paulownia tomentosa smaller?

The decisive tool is the secateurs: paulownia tomentosa 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 paulownia tomentosa 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.