Mature size & growth rate

How big does Artillery Plant (Pilea microphylla) get?

Also called Artillery Plant, Artillery Fern, Rockweed, Gunpowder Plant, Angeloweed.

More about artillery plant

About Artillery Plant

Pilea microphylla · also called Artillery Plant, Artillery Fern · houseplant

The artillery plant (Pilea microphylla) is a fine-textured, fern-like trailing houseplant in the nettle family, named for the way it puffs out pollen. It wants bright indirect light, consistently moist soil, and humidity above 50 percent. ASPCA lists it as non-toxic to cats, dogs, and horses, making it a genuinely pet-safe choice.

Mature size: Indoors typically 15-30 cm (6-12 in) tall with a spread of up to 60 cm (2 ft). Hardy outdoors only in USDA zones 11a-12b; elsewhere it is grown as a houseplant or warm-season annual.

Watch for — Leggy, sparse growth: Insufficient light stretches the stems and thins the foliage. Move to a brighter spot with indirect light and pinch back the tips regularly to encourage dense, bushy regrowth.

Indoor size vs how big it gets in the wild

Artillery Plant 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 15-30 cm (6-12 in) tall with a spread of up to 60 cm (2 ft). hardy outdoors only in usda zones 11a-12b. In the ground with no restriction it is a completely different plant — typically 15-30 cm (6-12 in) tall with a spread of up to 60 cm (2 ft). hardy outdoors only in usda zones 11a-12b — 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

Artillery Plant 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: feed lightly with a balanced, water-soluble houseplant fertiliser diluted to half strength roughly every 4-6 weeks during spring and summer. stop feeding in autumn and winter when growth slows. this is not a heavy feeder, and over-fertilising can burn the fine roots and tender foliage.

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

How to keep artillery plant smaller

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

Divide the clump every year or two — splitting artillery plant 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 artillery plant 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 artillery plant bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for artillery plant 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 artillery plant light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When artillery plant outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for artillery plant:

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 artillery plant repotting guide. If you want more of this plant instead of a bigger one, the artillery plant propagation guide turns prunings into new plants.

Artillery Plant size — frequently asked questions

How big does artillery plant get?

Artillery Plant reaches typically 15-30 cm (6-12 in) tall with a spread of up to 60 cm (2 ft). hardy outdoors only in usda zones 11a-12b when grown indoors, and far larger where it grows unrestricted (typically 15-30 cm (6-12 in) tall with a spread of up to 60 cm (2 ft). hardy outdoors only in usda zones 11a-12b). 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 artillery plant slow or fast growing?

Artillery Plant is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Artillery Plant 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 artillery plant 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 artillery plant smaller?

Divide the clump every year or two — splitting artillery plant 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 artillery plant 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.