Cold hardiness & minimum temperature

Is Japanese Anemone 'Honorine Jobert' (Anemone x hybrida)cold hardy? Hardiness zone & min temp

Also called Japanese Anemone, Windflower, Autumn Anemone.

More about japanese anemone 'honorine jobert'

About Japanese Anemone 'Honorine Jobert'

Anemone x hybrida · also called Japanese Anemone, Windflower · flowering

A stately late-summer and autumn perennial producing pure white, single flowers with golden stamens on tall, branching stems above bold, vine-like foliage. 'Honorine Jobert' is the oldest and most reliable white cultivar, vigorous once established and long-lived. Toxic to dogs and cats due to irritant compounds in the Ranunculaceae family.

Cold limit: USDA 4-8 · RHS H6 (-20-28°C)

What japanese anemone 'honorine jobert''s hardiness rating actually means

Yes — japanese anemone 'honorine jobert' is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 4-8 — 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 −20 to −15 °C. Japanese Anemone 'Honorine Jobert' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for japanese anemone 'honorine jobert' as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 japanese anemone 'honorine jobert' go outside or overwinter — and where?

Plant it out within USDA 4-8 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 japanese anemone 'honorine jobert' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Japanese Anemone 'Honorine Jobert' hardiness — frequently asked questions

Is japanese anemone 'honorine jobert' cold hardy?

Yes — japanese anemone 'honorine jobert' is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Japanese Anemone 'Honorine Jobert' is hardy across USDA 4-8; 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 japanese anemone 'honorine jobert' can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Japanese Anemone 'Honorine Jobert' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is japanese anemone 'honorine jobert'?

Japanese Anemone 'Honorine Jobert' is rated USDA 4-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can japanese anemone 'honorine jobert' survive winter outside?

Plant it out within USDA 4-8 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 japanese anemone 'honorine jobert' below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.