Cold hardiness & minimum temperature

Is Rosette Rock Jasmine (Androsace sempervivoides)cold hardy? Hardiness zone & min temp

Also called Rosette Rock Jasmine, Sempervivum-leaved Rock Jasmine.

More about rosette rock jasmine

About Rosette Rock Jasmine

Androsace sempervivoides · also called Rosette Rock Jasmine, Sempervivum-leaved Rock Jasmine · flowering

A compact Himalayan alpine forming dense cushions of small, tight rosettes studded with pink to mauve umbels in spring. Thrives in sharply drained, gritty scree or rock crevices. Keep roots evenly moist but never waterlogged, and water from below to protect rosettes from rot. Perfect for alpine troughs or raised beds.

Cold limit: USDA 5-7 · RHS H5 (-20 to 20°C)

What rosette rock jasmine's hardiness rating actually means

Yes — rosette rock jasmine is genuinely cold hardy. Rated RHS H5 and USDA 5-7, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 5-7 — 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 −15 to −10 °C. Rosette Rock Jasmine is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for rosette rock jasmine as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 rosette rock jasmine go outside or overwinter — and where?

Plant it out within USDA 5-7 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 rosette rock jasmine can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Rosette Rock Jasmine hardiness — frequently asked questions

Is rosette rock jasmine cold hardy?

Yes — rosette rock jasmine is genuinely cold hardy. Rated RHS H5 and USDA 5-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Rosette Rock Jasmine is hardy across USDA 5-7; 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 rosette rock jasmine can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Rosette Rock Jasmine is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is rosette rock jasmine?

Rosette Rock Jasmine is rated USDA 5-7 and RHS H5 — Hardy in most of the UK and in cold winters.

Can rosette rock jasmine survive winter outside?

Plant it out within USDA 5-7 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 rosette rock jasmine below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.