Cold hardiness & minimum temperature

Is Anemone coronaria 'Hollandia' (Anemone coronaria 'Hollandia')cold hardy? Hardiness zone & min temp

Also called Hollandia anemone, red poppy anemone, scarlet anemone.

More about anemone coronaria 'hollandia'

About Anemone coronaria 'Hollandia'

Anemone coronaria 'Hollandia' · also called Hollandia anemone, red poppy anemone · flowering

Anemone coronaria 'Hollandia' is a tuberous poppy anemone bearing single, scarlet-red flowers with a black central boss in spring. Grown from soaked corms planted in autumn (mild zones) or early spring, it suits borders, cutting gardens and containers. It needs full sun, sharply drained soil, and goes dormant after flowering once foliage yellows.

Cold limit: USDA 7-10 (lift corms or mulch heavily in zone 6 and colder) · RHS H4 (8-18°C)

What anemone coronaria 'hollandia''s hardiness rating actually means

Yes — anemone coronaria 'hollandia' is genuinely cold hardy. Rated RHS H4 and USDA 7-10 (lift corms or mulch heavily in zone 6 and colder), it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 7-10 (lift corms or mulch heavily in zone 6 and colder) — 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 −10 to −5 °C. Anemone coronaria 'Hollandia' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for anemone coronaria 'hollandia' as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 anemone coronaria 'hollandia' go outside or overwinter — and where?

Plant it out within USDA 7-10 (lift corms or mulch heavily in zone 6 and colder) 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 anemone coronaria 'hollandia' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline anemone coronaria 'hollandia'

Anemone coronaria 'Hollandia' 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.

Anemone coronaria 'Hollandia' hardiness — frequently asked questions

Is anemone coronaria 'hollandia' cold hardy?

Yes — anemone coronaria 'hollandia' is genuinely cold hardy. Rated RHS H4 and USDA 7-10 (lift corms or mulch heavily in zone 6 and colder), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Anemone coronaria 'Hollandia' is hardy across USDA 7-10 (lift corms or mulch heavily in zone 6 and colder); 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 anemone coronaria 'hollandia' can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Anemone coronaria 'Hollandia' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is anemone coronaria 'hollandia'?

Anemone coronaria 'Hollandia' is rated USDA 7-10 (lift corms or mulch heavily in zone 6 and colder) and RHS H4 — Hardy in an average winter across much of the temperate world.

Can anemone coronaria 'hollandia' survive winter outside?

Plant it out within USDA 7-10 (lift corms or mulch heavily in zone 6 and colder) 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 anemone coronaria 'hollandia' 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.