Mature size & growth rate

How big does Oriental Ostrich Fern (Matteuccia orientalis) get?

Also called Oriental Ostrich Fern.

More about oriental ostrich fern

About Oriental Ostrich Fern

Matteuccia orientalis · also called Oriental Ostrich Fern · houseplant

Unlike its spreading cousin Matteuccia struthiopteris, Oriental Ostrich Fern forms a well-behaved, non-stoloniferous clump of broadly arching deciduous sterile fronds surrounding persistent, upright fertile fronds that remain ornamental through winter. Native to moist woodlands of East Asia, it suits shady borders and container planting. RHS Award of Garden Merit holder.

Mature size: 50–100 cm tall × 50–100 cm wide

Watch for — Slow to establish after division: Divided plants may produce smaller, fewer fronds in their first season. Keep consistently moist, mulch well, and avoid disturbing the root ball again until the plant is re-established — usually by the second growing season.

Indoor size vs how big it gets in the wild

Oriental Ostrich 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 50–100 cm tall × 50–100 cm wide. 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.

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

Oriental Ostrich 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: apply a balanced granular fertiliser around the crown in early spring, or feed with a diluted liquid fertiliser monthly from april through july. avoid feeding after midsummer to allow fronds to harden before autumn.

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

How to keep oriental ostrich fern smaller

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

Divide the clump every year or two — splitting oriental ostrich 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 oriental ostrich 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 oriental ostrich fern bigger or faster

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

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Brighter light speeds up clump and offset production noticeably.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

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

When oriental ostrich fern outgrows the room (or the pot)

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

Oriental Ostrich Fern size — frequently asked questions

How big does oriental ostrich fern get?

Oriental Ostrich Fern reaches 50–100 cm tall × 50–100 cm wide when grown indoors. 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 oriental ostrich fern slow or fast growing?

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

Divide the clump every year or two — splitting oriental ostrich 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 oriental ostrich fern grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Brighter light speeds up clump and offset production noticeably. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.