Cold hardiness & minimum temperature

Is Rose Queen Barrenwort (Epimedium grandiflorum 'Rose Queen')cold hardy? Hardiness zone & min temp

Also called Rose Queen Barrenwort, Bishop's Hat, Fairy Wings.

More about rose queen barrenwort

About Rose Queen Barrenwort

Epimedium grandiflorum 'Rose Queen' · also called Rose Queen Barrenwort, Bishop's Hat · flowering

'Rose Queen' is one of the showiest Epimediums, producing large, deep rose-pink spurred flowers with white-tipped petals in mid-spring above heart-shaped, bronze-tinted new foliage. A superb semi-evergreen groundcover for dry shade beneath trees and shrubs. Deer-resistant, low-maintenance, and reliably perennial once established.

Cold limit: USDA 4-8 · RHS H6 (-20°C to 30°C)

Watch for — Flowers obscured by old foliage: Semi-evergreen leaves that persist from the previous year can hide the spring flowers. Cut all old foliage to the ground in late winter (February–March in the UK) before new growth and flower buds emerge.

What rose queen barrenwort's hardiness rating actually means

Yes — rose queen barrenwort is genuinely cold hardy. Rated RHS H6 and USDA 4-8, 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 4-8 — 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. Rose Queen Barrenwort is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for rose queen barrenwort 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 rose queen barrenwort go outside or overwinter — and where?

Plant it out within USDA 4-8 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 rose queen barrenwort can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Rose Queen Barrenwort hardiness — frequently asked questions

Is rose queen barrenwort cold hardy?

Yes — rose queen barrenwort is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Rose Queen Barrenwort is hardy across USDA 4-8; 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 rose queen barrenwort can survive?

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

What hardiness zone is rose queen barrenwort?

Rose Queen Barrenwort is rated USDA 4-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can rose queen barrenwort survive winter outside?

Plant it out within USDA 4-8 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 rose queen barrenwort 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.