Cold hardiness & minimum temperature

Is Cilician Winter Aconite (Eranthis cilicica)cold hardy? Hardiness zone & min temp

Also called Cilician winter aconite, Winter aconite.

More about cilician winter aconite

About Cilician Winter Aconite

Eranthis cilicica · also called Cilician winter aconite, Winter aconite · flowering

Native to Turkey, Greece, and the wider eastern Mediterranean region, Eranthis cilicica is closely related to the common winter aconite but produces slightly larger, bronze-tinged flowers and more finely divided, bronzy-green bracts, giving it a warmer, more ornamental character. Like E. hyemalis it blooms in late winter to early spring and naturalises under deciduous trees, but it is somewhat more tolerant of dry summer conditions. In the UK it is often sold under the Cilicica Group name, as the RHS treats it within that grouping. All parts are toxic to cats and dogs.

Cold limit: USDA 4-9 · RHS H6 (-15 to 18°C)

What cilician winter aconite's hardiness rating actually means

Yes — cilician winter aconite is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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 −20 to −15 °C. Cilician Winter Aconite is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for cilician winter aconite 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 cilician winter aconite go outside or overwinter — and where?

Plant it out within USDA 4-9 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 cilician winter aconite can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Cilician Winter Aconite hardiness — frequently asked questions

Is cilician winter aconite cold hardy?

Yes — cilician winter aconite is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Cilician Winter Aconite is hardy across USDA 4-9; 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 cilician winter aconite can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Cilician Winter Aconite is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is cilician winter aconite?

Cilician Winter Aconite is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can cilician winter aconite survive winter outside?

Plant it out within USDA 4-9 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 cilician winter aconite 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.