Cold hardiness & minimum temperature

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

Also called Eastern Cyclamen.

More about spring cyclamen

About Spring Cyclamen

Cyclamen coum · also called Eastern Cyclamen · flowering

Spring cyclamen is a compact, winter-to-early-spring flowering tuber with rounded, often silver-patterned leaves and squat magenta, pink or white blooms. Fully hardy, it carpets shady borders and woodland edges when little else flowers. Summer-dormant, it needs a dry rest. Smaller and earlier than its autumn-flowering ivy-leaved cousin.

Cold limit: USDA 5-9 (fully hardy garden plant) · RHS H5 (5-15°C)

Watch for — Botrytis (grey mould): Grey fuzzy mould on foliage in cold, damp, still air. Remove spent flowers and dead leaves and improve ventilation.

What spring cyclamen's hardiness rating actually means

Yes — spring cyclamen is genuinely cold hardy. Rated RHS H5 and USDA 5-9 (fully hardy garden plant), 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 (fully hardy garden plant) — 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. Spring Cyclamen is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 5-9 (fully hardy garden plant) 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 spring cyclamen can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Spring Cyclamen hardiness — frequently asked questions

Is spring cyclamen cold hardy?

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

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

What hardiness zone is spring cyclamen?

Spring Cyclamen is rated USDA 5-9 (fully hardy garden plant) and RHS H5 — Hardy in most of the UK and in cold winters.

Can spring cyclamen survive winter outside?

Plant it out within USDA 5-9 (fully hardy garden plant) 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 spring 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.