Cold hardiness & minimum temperature

Is Hairy Jovibarba (Jovibarba hirta)cold hardy? Hardiness zone & min temp

Also called Hairy Jovibarba, Hairy Houseleek.

More about hairy jovibarba

About Hairy Jovibarba

Jovibarba hirta · also called Hairy Jovibarba, Hairy Houseleek · houseplant

Jovibarba hirta is an alpine succulent from the eastern European mountains, distinguished by its noticeably hairy or ciliate leaf margins. It forms tight, attractive rosettes that offset freely, tolerating severe cold, poor soils, and drought. Perfect for rock gardens, alpine troughs, and sunny indoor windowsills, it needs almost no attention beyond good drainage.

Cold limit: USDA 4–9 · RHS H7 (-20°C to 28°C)

What hairy jovibarba's hardiness rating actually means

Yes — hairy jovibarba 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. Hairy Jovibarba is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for hairy jovibarba 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 hairy jovibarba 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 hairy jovibarba can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Hairy Jovibarba hardiness — frequently asked questions

Is hairy jovibarba cold hardy?

Yes — hairy jovibarba 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. Hairy Jovibarba 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 hairy jovibarba can survive?

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

What hardiness zone is hairy jovibarba?

Hairy Jovibarba is rated USDA 4–9 and RHS H7 — Hardy in the severest European continental winters.

Can hairy jovibarba 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 hairy jovibarba 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.