Cold hardiness & minimum temperature

Is Grape-leaved Anemone 'Robustissima' (Anemone tomentosa)cold hardy? Hardiness zone & min temp

Also called Grape-leaved Anemone, Hairy Anemone, Chinese Anemone.

More about grape-leaved anemone 'robustissima'

About Grape-leaved Anemone 'Robustissima'

Anemone tomentosa · also called Grape-leaved Anemone, Hairy Anemone · flowering

One of the toughest and most vigorous autumn-flowering anemones, producing single, pale pink flowers on tall, branching stems from late summer into autumn. 'Robustissima' spreads aggressively by rhizomes and is more tolerant of drought and cold than Japanese anemone hybrids. Toxic to dogs and cats as all Anemone species contain protoanemonin.

Cold limit: USDA 3-9 · RHS H7 (-25-30°C)

Watch for — Late frost damage: Late spring frosts can damage emerging shoots; protect young growth with fleece if a hard frost is forecast.

What grape-leaved anemone 'robustissima''s hardiness rating actually means

Yes — grape-leaved anemone 'robustissima' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 3-9 — 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 below about −20 °C. Grape-leaved Anemone 'Robustissima' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for grape-leaved anemone 'robustissima' as it gets too cold:

It tolerates winter lows to about −20 °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 grape-leaved anemone 'robustissima' go outside or overwinter — and where?

Plant it out within USDA 3-9 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 grape-leaved anemone 'robustissima' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Grape-leaved Anemone 'Robustissima' hardiness — frequently asked questions

Is grape-leaved anemone 'robustissima' cold hardy?

Yes — grape-leaved anemone 'robustissima' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Grape-leaved Anemone 'Robustissima' is hardy across USDA 3-9; 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 grape-leaved anemone 'robustissima' can survive?

Minimum survivable temperature is roughly below about −20 °C. Grape-leaved Anemone 'Robustissima' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is grape-leaved anemone 'robustissima'?

Grape-leaved Anemone 'Robustissima' is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can grape-leaved anemone 'robustissima' survive winter outside?

Plant it out within USDA 3-9 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 grape-leaved anemone 'robustissima' below its minimum temperature?

It tolerates winter lows to about −20 °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.