Mature size & growth rate

How big does Philodendron Imperial Red (Philodendron erubescens 'Imperial Red') get?

Also called Imperial Red Philodendron, Red-leaf Philodendron 'Imperial Red', Blushing Philodendron 'Imperial Red'.

More about philodendron imperial red

About Philodendron Imperial Red

Philodendron erubescens 'Imperial Red' · also called Imperial Red Philodendron, Red-leaf Philodendron 'Imperial Red' · houseplant

Philodendron 'Imperial Red' is a compact, self-heading aroid prized for glossy leaves that emerge deep burgundy-red before maturing to dark green. It thrives in bright indirect light, evenly moist soil, and warmth (18-29C). Easy to grow but toxic to cats and dogs per ASPCA, so keep it out of reach.

Mature size: Roughly 60-90 cm (2-3 ft) tall with a similar 60-90 cm leaf spread indoors; stays compact and does not vine.

Indoor size vs how big it gets in the wild

Philodendron Imperial Red 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 roughly 60-90 cm (2-3 ft) tall with a similar 60-90 cm leaf spread indoors. In the ground with no restriction it is a completely different plant — stays compact and does not vine. — 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

Philodendron Imperial Red is a fast grower. Realistically, expect one to three growing seasons — fast vines can add a metre or more of stem in a single good summer. Its feeding profile backs this up: feed every 4-6 weeks during spring and summer with a balanced, diluted (half-strength) liquid houseplant fertiliser. a urea-free formula is gentler on the roots. stop or sharply reduce feeding in autumn and winter when growth naturally slows, and flush the soil periodically to prevent salt buildup.

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

How to keep philodendron imperial red smaller

You are not stuck with the maximum size. For philodendron imperial red specifically, these are the levers, in order of impact:

Trim the longest vines back to the length you want — philodendron imperial red 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.
Expect to tidy it every few weeks in summer — this is a fast vine that will sprawl if left.

The keep-it-smaller method, step by step

Decide the length you want. Pick the point each vine of philodendron imperial red 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 philodendron imperial red bigger or faster

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

When philodendron imperial red outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for philodendron imperial red:

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

Philodendron Imperial Red size — frequently asked questions

How big does philodendron imperial red get?

Philodendron Imperial Red reaches roughly 60-90 cm (2-3 ft) tall with a similar 60-90 cm leaf spread indoors when grown indoors, and far larger where it grows unrestricted (stays compact and does not vine.). 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 philodendron imperial red slow or fast growing?

Philodendron Imperial Red is a fast grower. Expect one to three growing seasons — fast vines can add a metre or more of stem in a single good summer. Philodendron Imperial Red 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 philodendron imperial red take to reach full size?

Roughly one to three growing seasons — fast vines can add a metre or more of stem in a single good summer. Light, pot size and feeding move that timeline more than anything else.

How do I keep philodendron imperial red smaller?

Trim the longest vines back to the length you want — philodendron imperial red 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. Expect to tidy it every few weeks in summer — this is a fast vine that will sprawl if left.

How can I make philodendron imperial red 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.