Mature size & growth rate

How big does Ostrich Fern (Matteuccia struthiopteris) get?

Also called Shuttlecock fern, Fiddlehead fern.

More about ostrich fern

About Ostrich Fern

Matteuccia struthiopteris · also called Shuttlecock fern, Fiddlehead fern · edible

The ostrich fern is a striking deciduous fern forming tall, vase-shaped shuttlecocks of feathery fronds and the source of edible fiddleheads harvested in spring. It loves cool, damp, shaded ground and spreads by runners to colonise moist woodland. Fiddleheads are a prized vegetable but must be cooked thoroughly, as raw or undercooked ones cause illness.

Mature size: About 1-1.5 m tall and 0.6-1 m wide per crown; colonises outward over time.

Indoor size vs how big it gets in the wild

Ostrich Fern is a tree at heart. Indoors a pot and your ceiling keep it to about 1-1.5 m tall and 0.6-1 m wide per crown, but in the ground it is a different scale of plant entirely (colonises outward over time.). Indoors and in a pot, expect about 1-1.5 m tall and 0.6-1 m wide per crown. In the ground with no restriction it is a completely different plant — colonises outward over time. — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Growth rate and years to mature

Ostrich Fern is a fast grower. Realistically, expect two to four years from a young plant to a room-filling specimen in good light. Its feeding profile backs this up: light feeder in rich soil. an annual spring mulch of compost or leaf mould usually meets its needs; avoid heavy nitrogen, which produces weak fronds.

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

How to keep ostrich fern smaller

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

The decisive tool is the secateurs: ostrich fern can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape.
Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size.
Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height.
Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

The keep-it-smaller method, step by step

Pick the new height. Decide how tall you want ostrich fern and find a leaf node or branch point just below that.
Top the main stem. Cut the main growing tip cleanly just above that node in spring; this permanently caps the height and forces side branches.
Keep the pot snug. Avoid jumping to a much bigger pot — a slightly restricted rootball keeps the whole plant smaller.
Maintain the shape. Prune back the tallest new leaders each spring to hold it at the height you chose.

How to grow ostrich fern bigger or faster

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

The biggest lever is light — a tree-type plant in dim light barely gains height; move it brighter.
Pot up a size every year or two while young; restricted roots are the main thing holding height back.
Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.

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

When ostrich fern outgrows the room (or the pot)

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

The top leaves pressing against or bent by the ceiling — the classic "this is now too tall indoors" sign.
It has to be moved away from a light source it has literally outgrown.
Roots filling the largest pot you can reasonably keep indoors — at that point it is top-or-prune or move it outside (if hardy).

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

Ostrich Fern size — frequently asked questions

How big does ostrich fern get?

Ostrich Fern reaches about 1-1.5 m tall and 0.6-1 m wide per crown when grown indoors, and far larger where it grows unrestricted (colonises outward over time.). It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Is ostrich fern slow or fast growing?

Ostrich Fern is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Ostrich Fern is a tree at heart. Indoors a pot and your ceiling keep it to about 1-1.5 m tall and 0.6-1 m wide per crown, but in the ground it is a different scale of plant entirely (colonises outward over time.).

How long does ostrich fern take to reach full size?

Roughly two to four years from a young plant to a room-filling specimen in good light. Light, pot size and feeding move that timeline more than anything else.

How do I keep ostrich fern smaller?

The decisive tool is the secateurs: ostrich fern can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape. Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size. Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height. Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

How can I make ostrich fern grow bigger or faster?

The biggest lever is light — a tree-type plant in dim light barely gains height; move it brighter. Pot up a size every year or two while young; restricted roots are the main thing holding height back. Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.