Mature size & growth rate

How big does Little Bunny Fountain Grass (Pennisetum alopecuroides 'Little Bunny') get?

Also called little bunny fountain grass, miniature fountain grass.

More about little bunny fountain grass

About Little Bunny Fountain Grass

Pennisetum alopecuroides 'Little Bunny' · also called little bunny fountain grass, miniature fountain grass · flowering

'Little Bunny' is the dwarf of the fountain grass family, a tidy 30-45 cm clump of arching green blades topped in late summer with fuzzy, buff-pink foxtail plumes. It thrives in full sun and average soil, turns golden-amber in autumn, and is grown widely in rock gardens, edging, and containers across US and UK borders.

Mature size: 30-45 cm tall and 30-45 cm wide, including flower plumes; one of the smallest fountain grasses.

Watch for — Slow spring emergence: As a warm-season grass it greens up late. Don't assume it has died over winter; cut last year's foliage back before new growth pushes.

Indoor size vs how big it gets in the wild

Little Bunny Fountain Grass 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 30-45 cm tall and 30-45 cm wide, including flower plumes. In the ground with no restriction it is a completely different plant — one of the smallest fountain grasses. — 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

Little Bunny Fountain Grass 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: light feeders. a single spring application of balanced slow-release fertiliser, or a top-dressing of compost, is plenty. excess nitrogen causes floppy, weak growth and fewer plumes.

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

How to keep little bunny fountain grass smaller

You are not stuck with the maximum size. For little bunny fountain grass specifically, these are the levers, in order of impact:

Divide the clump every year or two — splitting little bunny fountain grass 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 little bunny fountain grass 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 little bunny fountain grass bigger or faster

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

When little bunny fountain grass outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for little bunny fountain grass:

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

Little Bunny Fountain Grass size — frequently asked questions

How big does little bunny fountain grass get?

Little Bunny Fountain Grass reaches 30-45 cm tall and 30-45 cm wide, including flower plumes when grown indoors, and far larger where it grows unrestricted (one of the smallest fountain grasses.). 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 little bunny fountain grass slow or fast growing?

Little Bunny Fountain Grass is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Little Bunny Fountain Grass 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 little bunny fountain grass 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 little bunny fountain grass smaller?

Divide the clump every year or two — splitting little bunny fountain grass 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 little bunny fountain grass 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.