Mature size & growth rate

How big does Shoestring Fern (Vittaria lineata) get?

Also called Shoestring Fern, Grass Fern.

More about shoestring fern

About Shoestring Fern

Vittaria lineata · also called Shoestring Fern, Grass Fern · houseplant

Shoestring fern is an unusual epiphytic fern whose narrow, grass-like fronds hang in long pendent ribbons, resembling tangled shoestrings. Native to humid subtropical forests of the Americas, it grows on tree trunks and palm boots in deep shade, demanding very high humidity and warmth. Best displayed mounted or in a hanging basket, with fronds reaching 30-60 cm.

Mature size: Fronds typically 30-60 cm long and only a few millimetres wide, hanging in dense ribbon-like clusters.

Watch for — Sparse or stalled growth: Often too little humidity or too cold. Maintain warmth above 18°C and consistently high moisture to encourage new fronds.

Indoor size vs how big it gets in the wild

Shoestring 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 fronds typically 30-60 cm long and only a few millimetres wide, hanging in dense ribbon-like clusters.. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

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

Shoestring Fern 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 very lightly every 4-6 weeks in the growing season with a quarter-strength balanced liquid or foliar feed applied to the moss and roots. this delicate epiphyte is easily burned by concentrated fertiliser.

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

How to keep shoestring fern smaller

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

Trim the longest vines back to the length you want — shoestring 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.
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 shoestring 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 shoestring fern bigger or faster

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

More (indirect) light dramatically lengthens the vines and enlarges the leaves.
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 shoestring fern light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When shoestring fern outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for shoestring 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 shoestring fern repotting guide. If you want more of this plant instead of a bigger one, the shoestring fern propagation guide turns prunings into new plants.

Shoestring Fern size — frequently asked questions

How big does shoestring fern get?

Shoestring Fern reaches fronds typically 30-60 cm long and only a few millimetres wide, hanging in dense ribbon-like clusters. when grown indoors. 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 shoestring fern slow or fast growing?

Shoestring Fern is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Shoestring 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 shoestring fern 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 shoestring fern smaller?

Trim the longest vines back to the length you want — shoestring 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. A trim once or twice a season is usually enough to hold its length.

How can I make shoestring fern grow bigger or faster?

More (indirect) light dramatically lengthens the vines and enlarges the leaves. 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.