Cold hardiness & minimum temperature

Is Heuffel's Houseleek (Jovibarba heuffelii)cold hardy? Hardiness zone & min temp

Also called Heuffel's Houseleek, Job's Beard, Heuffel's Jovibarba.

More about heuffel's houseleek

About Heuffel's Houseleek

Jovibarba heuffelii · also called Heuffel's Houseleek, Job's Beard · flowering

Jovibarba heuffelii (also widely listed as Sempervivum heuffelii) is a distinctive succulent houseleek from the Carpathian mountains of southeastern Europe, forming tightly clustered mounds of flat, open rosettes in greens, reds, and purples depending on the cultivar. Unlike most Sempervivum and other Jovibarba, it does not produce offset chicks on stolons; instead, baby rosettes develop between the leaves of the mother rosette and are separated by division — making division the only vegetative propagation method. It needs full sun and excellent drainage. Jovibarba heuffelii is not individually listed by the ASPCA, but based on its close botanical relationship to Sempervivum (which is ASPCA non-toxic), it is considered low-risk; classify as mildly-toxic in the absence of a direct ASPCA confirmation.

Cold limit: USDA 4-9 · RHS H7 (-34°C to 35°C)

Watch for — Crown rot from overwatering or winter wet: Sitting moisture at the dense rosette cluster, particularly at low temperatures, causes the centre to blacken and collapse. Ensure grit-based compost, tip containers to drain after heavy rain, and avoid wetting the rosette crown when watering.

What heuffel's houseleek's hardiness rating actually means

Yes — heuffel's houseleek 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. Heuffel's Houseleek is built for winter — once established it takes hard frost and snow in its stride.

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

Heuffel's Houseleek hardiness — frequently asked questions

Is heuffel's houseleek cold hardy?

Yes — heuffel's houseleek 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. Heuffel's Houseleek 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 heuffel's houseleek can survive?

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

What hardiness zone is heuffel's houseleek?

Heuffel's Houseleek is rated USDA 4-9 and RHS H7 — Hardy in the severest European continental winters.

Can heuffel's houseleek 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 heuffel's houseleek 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.