Mature size & growth rate

How big does Macho Fern (Nephrolepis biserrata 'Macho') get?

Also called Giant sword fern, Broad sword fern.

More about macho fern

About Macho Fern

Nephrolepis biserrata 'Macho' · also called Giant sword fern, Broad sword fern · tropical

The Macho Fern is a large, robust sword fern with broad, arching fronds that can reach well over a metre long, giving a dramatic tropical presence on patios and in big rooms. It is more sun- and drought-tolerant than Boston ferns but still wants moisture and warmth, and it is fully pet-safe.

Mature size: Fronds commonly 90-120 cm long, occasionally to 1.5 m or more; the plant spans 0.9-1.5 m wide.

Watch for — Rapid drying and wilting: Its size and vigour make it thirsty, especially in containers and heat. Water more often and consider a larger pot or a self-watering setup; mulch outdoor plants.

Indoor size vs how big it gets in the wild

Macho Fern is a tree at heart. Indoors a pot and your ceiling keep it to fronds commonly 90-120 cm long, occasionally to 1.5 m or more, but in the ground it is a different scale of plant entirely (the plant spans 0.9-1.5 m wide.). Indoors and in a pot, expect fronds commonly 90-120 cm long, occasionally to 1.5 m or more. In the ground with no restriction it is a completely different plant — the plant spans 0.9-1.5 m wide. — 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

Macho 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: a vigorous grower, so feed every 2 weeks in spring and summer with a balanced liquid feed at half to full strength, or use a slow-release granule at potting. larger plants are hungrier than small ferns. reduce feeding in autumn and stop over winter.

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

How to keep macho fern smaller

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

The decisive tool is the secateurs: macho 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 macho 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 macho fern bigger or faster

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

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators.
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 macho fern light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When macho fern outgrows the room (or the pot)

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

Macho Fern size — frequently asked questions

How big does macho fern get?

Macho Fern reaches fronds commonly 90-120 cm long, occasionally to 1.5 m or more when grown indoors, and far larger where it grows unrestricted (the plant spans 0.9-1.5 m wide.). 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 macho fern slow or fast growing?

Macho Fern is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Macho Fern is a tree at heart. Indoors a pot and your ceiling keep it to fronds commonly 90-120 cm long, occasionally to 1.5 m or more, but in the ground it is a different scale of plant entirely (the plant spans 0.9-1.5 m wide.).

How long does macho 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 macho fern smaller?

The decisive tool is the secateurs: macho 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 macho fern grow bigger or faster?

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators. 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.