Cold hardiness & minimum temperature

Is Marble Houseleek (Sempervivum marmoreum)cold hardy? Hardiness zone & min temp

Also called Marble Houseleek, Marbled Houseleek.

More about marble houseleek

About Marble Houseleek

Sempervivum marmoreum · also called Marble Houseleek, Marbled Houseleek · houseplant

Sempervivum marmoreum is a striking alpine succulent from the Balkans and Carpathians, named for its marbled green-and-red leaf colouring. It forms symmetrical, medium-sized rosettes that offset freely to create dense mats. Exceptionally frost-hardy and drought-tolerant, it thrives in gritty, sun-drenched positions and asks for very little beyond good drainage.

Cold limit: USDA 4–9 · RHS H7 (-25°C to 30°C)

Watch for — Crown rot: Caused by excess moisture, particularly in winter. Ensure perfectly drained substrate, water only at the base, and protect outdoor containers from prolonged rain in cold months.

What marble houseleek's hardiness rating actually means

Yes — marble 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. Marble Houseleek is built for winter — once established it takes hard frost and snow in its stride.

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

Marble Houseleek hardiness — frequently asked questions

Is marble houseleek cold hardy?

Yes — marble 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. Marble 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 marble houseleek can survive?

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

What hardiness zone is marble houseleek?

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

Can marble 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 marble 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.