Cold hardiness & minimum temperature

Is Green Snowdrop (Galanthus woronowii)cold hardy? Hardiness zone & min temp

Also called Woronow's Snowdrop, Green-leaved Snowdrop.

More about green snowdrop

About Green Snowdrop

Galanthus woronowii · also called Woronow's Snowdrop, Green-leaved Snowdrop · flowering

Galanthus woronowii is a robust snowdrop from the Caucasus distinguished by its broad, glossy bright-green leaves — wider and shinier than common G. nivalis. Flowers in late winter with typical white pendent bells. Naturalises readily under deciduous trees. Toxic to pets and humans due to galanthamine and related alkaloids.

Cold limit: USDA 4–9 · RHS H6 (−15–18°C)

What green snowdrop's hardiness rating actually means

Yes — green snowdrop 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. Green Snowdrop is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for green snowdrop 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 green snowdrop 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 green snowdrop can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Green Snowdrop hardiness — frequently asked questions

Is green snowdrop cold hardy?

Yes — green snowdrop 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. Green Snowdrop 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 green snowdrop can survive?

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

What hardiness zone is green snowdrop?

Green Snowdrop is rated USDA 4–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can green snowdrop 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 green snowdrop 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.