Cold hardiness & minimum temperature

Is Green-winged Orchid (Anacamptis morio)cold hardy? Hardiness zone & min temp

Also called Green-winged Orchid, Green-veined Orchid.

More about green-winged orchid

About Green-winged Orchid

Anacamptis morio · also called Green-winged Orchid, Green-veined Orchid · flowering

Anacamptis morio (formerly Orchis morio) is a compact terrestrial orchid native to traditional, unimproved grasslands across Europe, including lowland England and Wales, where it has declined sharply due to habitat loss. It produces dense spikes of pink to purple flowers (occasionally white) with a distinctive hood striped with dark green veins in late April and May. Unlike many terrestrial orchids it can be introduced to short, low-fertility turf gardens given the correct soil mycobiome. The Orchidaceae family is broadly considered non-toxic to pets.

Cold limit: USDA 5-8 · RHS H6 (-20 to 23°C)

What green-winged orchid's hardiness rating actually means

Yes — green-winged orchid is genuinely cold hardy. Rated RHS H6 and USDA 5-8, 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 5-8 — 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. Green-winged Orchid is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for green-winged orchid 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-winged orchid go outside or overwinter — and where?

Plant it out within USDA 5-8 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 green-winged orchid can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Green-winged Orchid hardiness — frequently asked questions

Is green-winged orchid cold hardy?

Yes — green-winged orchid is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Green-winged Orchid is hardy across USDA 5-8; 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 green-winged orchid can survive?

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

What hardiness zone is green-winged orchid?

Green-winged Orchid is rated USDA 5-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can green-winged orchid survive winter outside?

Plant it out within USDA 5-8 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 green-winged orchid 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.