Cold hardiness & minimum temperature

Is Eastern Cyclamen (Cyclamen coum)cold hardy? Hardiness zone & min temp

Also called Eastern cyclamen, Eastern sowbread, Coum cyclamen.

More about eastern cyclamen

About Eastern Cyclamen

Cyclamen coum · also called Eastern cyclamen, Eastern sowbread · flowering

Cyclamen coum is a dwarf, tuberous perennial native to the eastern Mediterranean region from Bulgaria to Turkey, Lebanon, and the Caucasus, producing jewel-like magenta, pink, or white flowers with reflexed petals from December to March, making it one of the most valuable winter-flowering garden plants. The rounded, dark green to silver-patterned leaves are attractive from autumn through spring. It thrives in the dry shade under deciduous trees and shrubs, naturalising in leafy soil where it can be left undisturbed. All parts are highly toxic to cats and dogs due to saponins.

Cold limit: USDA 5-9 · RHS H5 (-15 to 20 °C)

What eastern cyclamen's hardiness rating actually means

Yes — eastern cyclamen is genuinely cold hardy. Rated RHS H5 and USDA 5-9, 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 5-9 — 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 −15 to −10 °C. Eastern Cyclamen is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for eastern cyclamen 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 eastern cyclamen go outside or overwinter — and where?

Plant it out within USDA 5-9 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 eastern cyclamen can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Eastern Cyclamen hardiness — frequently asked questions

Is eastern cyclamen cold hardy?

Yes — eastern cyclamen is genuinely cold hardy. Rated RHS H5 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Eastern Cyclamen is hardy across USDA 5-9; 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 eastern cyclamen can survive?

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

What hardiness zone is eastern cyclamen?

Eastern Cyclamen is rated USDA 5-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can eastern cyclamen survive winter outside?

Plant it out within USDA 5-9 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 eastern cyclamen below its minimum temperature?

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.