Mature size & growth rate

How big does Glory Bower (Clerodendrum splendens) get?

Also called Flaming Glorybower, Scarlet Glorybower, Red Clerodendrum.

More about glory bower

About Glory Bower

Clerodendrum splendens · also called Flaming Glorybower, Scarlet Glorybower · tropical

Clerodendrum splendens is a spectacular tropical twining shrub from West Africa bearing dense clusters of brilliant scarlet flowers against glossy dark-green foliage. It blooms most freely in late winter to spring in warm, humid conditions. Treat as mildly toxic to pets, as the Clerodendrum genus contains compounds that may cause gastrointestinal upset.

Mature size: 2-4 m with support indoors; up to 6 m outdoors in tropical climates

Indoor size vs how big it gets in the wild

Glory Bower does not get tall — it gets long. Size here is about stem length and how you train or cut it, not how much floor it claims. Indoors and in a pot, expect 2-4 m with support indoors. In the ground with no restriction it is a completely different plant — up to 6 m outdoors in tropical climates — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

Growth shows up as lengthening stems that trail down or climb up a support; the plant can be kept tiny or grown metres long from the exact same root system.

Growth rate and years to mature

Glory Bower is a moderate grower. Realistically, expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Its feeding profile backs this up: feed every two weeks with a high-potassium liquid fertiliser at half strength during spring and summer flowering periods. reduce to monthly in autumn and cease feeding entirely in winter. phosphorus-rich feeds can also promote flower bud formation.

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

How to keep glory bower smaller

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

Trim the longest vines back to the length you want — glory bower takes hard cutting well and bushes out from the cut.
Cut just above a leaf node; each trimmed stem usually branches into two, so pruning makes it fuller, not sparser.
The cuttings root easily in water or mix, so "keeping it smaller" doubles as free new plants.
A trim once or twice a season is usually enough to hold its length.

The keep-it-smaller method, step by step

Decide the length you want. Pick the point each vine of glory bower should stop — you can be aggressive; it regrows readily.
Cut just above a node. Snip about 0.5 cm above a leaf node so the stem branches there instead of dying back.
Root the cuttings. Drop the trimmed pieces in water or mix — they root in 2-4 weeks and can fill the same pot for a bushier look.
Repeat as it runs. Re-trim whenever it overshoots; regular light pruning keeps it both smaller and fuller.

How to grow glory bower bigger or faster

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

Good light plus a moss pole or trellis triggers the longest, fastest, largest-leaved growth.
Give it something to climb — many vines grow far faster and bigger up a support than trailing.
Feed through spring and summer and keep it consistently watered while it is actively running.

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

When glory bower outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for glory bower:

Vines pooling on the floor or wrapping past where you want them — purely a trimming cue, not a repot one.
Bare, leggy stems with leaves only at the tips (usually a light problem, not a size one).
A tangled mass that has outrun its support and needs cutting back and re-training.

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

Glory Bower size — frequently asked questions

How big does glory bower get?

Glory Bower reaches 2-4 m with support indoors when grown indoors, and far larger where it grows unrestricted (up to 6 m outdoors in tropical climates). Growth shows up as lengthening stems that trail down or climb up a support; the plant can be kept tiny or grown metres long from the exact same root system.

Is glory bower slow or fast growing?

Glory Bower is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Glory Bower does not get tall — it gets long. Size here is about stem length and how you train or cut it, not how much floor it claims.

How long does glory bower take to reach full size?

Roughly three to six years to reach mature indoor size, gaining a steady amount each growing season. Light, pot size and feeding move that timeline more than anything else.

How do I keep glory bower smaller?

Trim the longest vines back to the length you want — glory bower takes hard cutting well and bushes out from the cut. Cut just above a leaf node; each trimmed stem usually branches into two, so pruning makes it fuller, not sparser. The cuttings root easily in water or mix, so "keeping it smaller" doubles as free new plants. A trim once or twice a season is usually enough to hold its length.

How can I make glory bower grow bigger or faster?

Good light plus a moss pole or trellis triggers the longest, fastest, largest-leaved growth. Give it something to climb — many vines grow far faster and bigger up a support than trailing. Feed through spring and summer and keep it consistently watered while it is actively running.