Cold hardiness & minimum temperature

Is Little Bunny Fountain Grass (Pennisetum alopecuroides 'Little Bunny')cold hardy? Hardiness zone & min temp

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.

Cold limit: USDA 5-9 · RHS H5 (-1 to 30°C)

Watch for — Crown rot in wet soil: Heavy, poorly drained soil over winter rots the crown. Plant in free-draining ground and avoid mulch piled against the base.

What little bunny fountain grass's hardiness rating actually means

Yes — little bunny fountain grass is genuinely cold hardy. Rated RHS H5 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 5-9 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about −15 to −10 °C. Little Bunny Fountain Grass is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for little bunny fountain grass as it gets too cold:

It tolerates winter lows to about −15 to −10 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can little bunny fountain grass go outside or overwinter — and where?

Plant it out within USDA 5-9 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when little bunny fountain grass can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Little Bunny Fountain Grass hardiness — frequently asked questions

Is little bunny fountain grass cold hardy?

Yes — little bunny fountain grass is genuinely cold hardy. Rated RHS H5 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Little Bunny Fountain Grass is hardy across USDA 5-9; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature little bunny fountain grass can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Little Bunny Fountain Grass is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is little bunny fountain grass?

Little Bunny Fountain Grass is rated USDA 5-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can little bunny fountain grass survive winter outside?

Plant it out within USDA 5-9 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to little bunny fountain grass below its minimum temperature?

It tolerates winter lows to about −15 to −10 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.