Mature size & growth rate

How big does Old World Climbing Fern (Lygodium microphyllum) get?

Also called Small-leaf Climbing Fern, Climbing Fern.

More about old world climbing fern

About Old World Climbing Fern

Lygodium microphyllum · also called Small-leaf Climbing Fern, Climbing Fern · tropical

Lygodium microphyllum is a vigorous tropical climbing fern from Africa, Asia, and Australia, notorious as an invasive species in Florida. While striking as a conservatory or greenhouse climber, it must be grown responsibly in controlled settings. No ASPCA toxicity concerns; true ferns are generally pet-safe.

Mature size: Up to 10 m in optimal outdoor conditions; 2-3 m in containers with support

Watch for — Rampant growth: Can quickly overwhelm a support structure. Prune back regularly to keep the plant to a manageable size.

Indoor size vs how big it gets in the wild

Old World Climbing Fern 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 up to 10 m in optimal outdoor conditions. In the ground with no restriction it is a completely different plant — 2-3 m in containers with support — 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

Old World Climbing Fern 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: apply a balanced liquid fertiliser at half strength every 2-4 weeks during the growing season. this is a fast-growing species that benefits from regular feeding in containers.

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

How to keep old world climbing fern smaller

You are not stuck with the maximum size. For old world climbing fern specifically, these are the levers, in order of impact:

Trim the longest vines back to the length you want — old world climbing fern 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 old world climbing fern 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 old world climbing fern bigger or faster

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

When old world climbing fern outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for old world climbing fern:

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 old world climbing fern repotting guide. If you want more of this plant instead of a bigger one, the old world climbing fern propagation guide turns prunings into new plants.

Old World Climbing Fern size — frequently asked questions

How big does old world climbing fern get?

Old World Climbing Fern reaches up to 10 m in optimal outdoor conditions when grown indoors, and far larger where it grows unrestricted (2-3 m in containers with support). 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 old world climbing fern slow or fast growing?

Old World Climbing Fern 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. Old World Climbing Fern 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 old world climbing fern 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 old world climbing fern smaller?

Trim the longest vines back to the length you want — old world climbing fern 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 old world climbing fern 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.