Cold hardiness & minimum temperature

Is Pink Pampas Grass (Cortaderia selloana 'Rendatleri')cold hardy? Hardiness zone & min temp

Also called Pink Pampas Grass, Rendatleri Pampas Grass.

More about pink pampas grass

About Pink Pampas Grass

Cortaderia selloana 'Rendatleri' · also called Pink Pampas Grass, Rendatleri Pampas Grass · flowering

A striking pampas grass cultivar producing large, silky rose-pink plumes on tall canes up to 3 m in late summer and autumn. One of the most ornamental of the large pampas varieties. Highly drought-tolerant once established. Like all Cortaderia, the leaf edges are razor-sharp; mildly toxic if ingested.

Cold limit: USDA 7-11 · RHS H5 (−10–38°C)

Watch for — Crown rot: Caused by winter waterlogging; plant on a slope or raised bed if drainage is questionable.

What pink pampas grass's hardiness rating actually means

Yes — pink pampas grass is genuinely cold hardy. Rated RHS H5 and USDA 7-11, 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 7-11 — 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. Pink Pampas Grass is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for pink pampas 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 pink pampas grass go outside or overwinter — and where?

Plant it out within USDA 7-11 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 pink pampas grass can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Frost protection for borderline pink pampas grass

Pink Pampas Grass is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes.
Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness.
Shelter new growth from late spring frosts with fleece if a hard night is forecast.

Pink Pampas Grass hardiness — frequently asked questions

Is pink pampas grass cold hardy?

Yes — pink pampas grass is genuinely cold hardy. Rated RHS H5 and USDA 7-11, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Pink Pampas Grass is hardy across USDA 7-11; 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 pink pampas grass can survive?

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

What hardiness zone is pink pampas grass?

Pink Pampas Grass is rated USDA 7-11 and RHS H5 — Hardy in most of the UK and in cold winters.

Can pink pampas grass survive winter outside?

Plant it out within USDA 7-11 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.

How do I protect pink pampas grass from frost?

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes. Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness. Shelter new growth from late spring frosts with fleece if a hard night is forecast.