Mature size & growth rate

How big does Silver lace fern (Pteris ensiformis 'Evergemiensis') get?

Also called silver lace fern, silver brake fern, slender brake fern, Victorian table fern, sword brake fern.

More about silver lace fern

About Silver lace fern

Pteris ensiformis 'Evergemiensis' · also called silver lace fern, silver brake fern · houseplant

Silver lace fern is a compact tropical brake fern prized for fronds striped with silvery-white centres. Indoors it wants bright indirect light, constantly moist humus-rich soil, and high humidity, and it has zero tolerance for drying out. The ASPCA lists Pteris ferns as non-toxic to cats and dogs, making it a pet-safe choice.

Mature size: Indoors typically 30-45 cm tall and wide; stays compact, making it well suited to terrariums and small spaces

Indoor size vs how big it gets in the wild

Silver lace fern stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward. Indoors and in a pot, expect typically 30-45 cm tall and wide. In the ground with no restriction it is a completely different plant — stays compact, making it well suited to terrariums and small spaces — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Growth rate and years to mature

Silver lace 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 monthly through spring and summer with a balanced liquid houseplant feed diluted to half strength; ferns are light feeders and full-strength fertiliser can burn the roots and brown the frond tips. stop feeding in autumn and winter.

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

How to keep silver lace fern smaller

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

Divide the clump every year or two — splitting silver lace fern is the main way to control its spread and refresh it.
Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump.
Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

The keep-it-smaller method, step by step

Lift the whole plant. Slide silver lace fern out of its pot in spring when the clump has filled it.
Split the clump. Tease or cut the rootball into two or more sections, each with healthy roots and growth.
Repot one division. Put a single division back in the original pot to reset it to a smaller size; pot or give away the rest.
Remove offsets as they form. Through the year, detach new runners or pups to stop it spreading again.

How to grow silver lace fern bigger or faster

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

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Good light plus regular feeding maximises offset and runner production.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

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

When silver lace fern outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for silver lace fern:

The clump bulging over the pot rim or splitting the pot — the cue to divide, not to find a bigger room.
A dense centre that goes bare or tired while the edges keep spreading.
Runners or offsets escaping across the shelf or into neighbouring pots.

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

Silver lace fern size — frequently asked questions

How big does silver lace fern get?

Silver lace fern reaches typically 30-45 cm tall and wide when grown indoors, and far larger where it grows unrestricted (stays compact, making it well suited to terrariums and small spaces). Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Is silver lace fern slow or fast growing?

Silver lace fern is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Silver lace fern stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward.

How long does silver lace 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 silver lace fern smaller?

Divide the clump every year or two — splitting silver lace fern is the main way to control its spread and refresh it. Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump. Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

How can I make silver lace fern grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Good light plus regular feeding maximises offset and runner production. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.