Cold hardiness & minimum temperature

Is Bicolor Barrenwort (Epimedium x versicolor)cold hardy? Hardiness zone & min temp

Also called Bicolor Barrenwort, Bicolor Epimedium, Fairy Wings.

More about bicolor barrenwort

About Bicolor Barrenwort

Epimedium x versicolor · also called Bicolor Barrenwort, Bicolor Epimedium · flowering

A tough, semi-evergreen groundcover perennial for dry shade, producing clusters of bicoloured yellow and cream flowers on wiry stems in spring. Foliage emerges red-tinged, turns green in summer, and reddens again in autumn. Drought-tolerant once established, suppressing weeds under trees and shrubs. Hardy to USDA zone 4.

Cold limit: USDA 4-9 · RHS H7 (-18 to 32°C)

Watch for — Winter foliage tattering: Cold, drying winds shred the semi-evergreen foliage. Cut all old leaves to the ground in late winter, before flower buds emerge, to reveal the flowers and encourage fresh growth.

What bicolor barrenwort's hardiness rating actually means

Yes — bicolor barrenwort is genuinely cold hardy. Rated RHS H7 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. 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 below about −20 °C. Bicolor Barrenwort is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for bicolor barrenwort as it gets too cold:

It tolerates winter lows to about −20 °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 bicolor barrenwort 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 bicolor barrenwort can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Bicolor Barrenwort hardiness — frequently asked questions

Is bicolor barrenwort cold hardy?

Yes — bicolor barrenwort is genuinely cold hardy. Rated RHS H7 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Bicolor Barrenwort 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 bicolor barrenwort can survive?

Minimum survivable temperature is roughly below about −20 °C. Bicolor Barrenwort is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is bicolor barrenwort?

Bicolor Barrenwort is rated USDA 4-9 and RHS H7 — Hardy in the severest European continental winters.

Can bicolor barrenwort 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 bicolor barrenwort below its minimum temperature?

It tolerates winter lows to about −20 °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.