Cold hardiness & minimum temperature

Is Frohnleiten Epimedium (Epimedium × perralchicum 'Frohnleiten')cold hardy? Hardiness zone & min temp

Also called Frohnleiten barrenwort, yellow evergreen epimedium.

More about frohnleiten epimedium

About Frohnleiten Epimedium

Epimedium × perralchicum 'Frohnleiten' · also called Frohnleiten barrenwort, yellow evergreen epimedium · flowering

'Frohnleiten' is a robust, evergreen barrenwort grown for glossy, spiny-edged leaflets that emerge marbled red-bronze and flush red in winter, plus bright yellow spurred flowers in spring. One of the most vigorous and drought-tolerant epimediums, it forms a dense, glossy evergreen ground cover that thrives in dry shade where little else succeeds.

Cold limit: USDA 5-9 · RHS H7 (10-24°C)

Watch for — Worn evergreen leaves: Old foliage can look battered by late winter. Cut it back in late February to reveal fresh growth and the spring flowers.

What frohnleiten epimedium's hardiness rating actually means

Yes — frohnleiten epimedium is genuinely cold hardy. Rated RHS H7 and USDA 5-9, 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 5-9 — 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. Frohnleiten Epimedium is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for frohnleiten epimedium 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 frohnleiten epimedium go outside or overwinter — and where?

Plant it out within USDA 5-9 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 frohnleiten epimedium can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Frohnleiten Epimedium hardiness — frequently asked questions

Is frohnleiten epimedium cold hardy?

Yes — frohnleiten epimedium is genuinely cold hardy. Rated RHS H7 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Frohnleiten Epimedium is hardy across USDA 5-9; 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 frohnleiten epimedium can survive?

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

What hardiness zone is frohnleiten epimedium?

Frohnleiten Epimedium is rated USDA 5-9 and RHS H7 — Hardy in the severest European continental winters.

Can frohnleiten epimedium survive winter outside?

Plant it out within USDA 5-9 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 frohnleiten epimedium 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.