Cold hardiness & minimum temperature

Is Woolly Rock Jasmine (Androsace lanuginosa)cold hardy? Hardiness zone & min temp

Also called Woolly Rock Jasmine, Lanuginose Androsace.

More about woolly rock jasmine

About Woolly Rock Jasmine

Androsace lanuginosa · also called Woolly Rock Jasmine, Lanuginose Androsace · flowering

Woolly Rock Jasmine is a trailing, silver-hairy alpine perennial from the Himalayas, forming long, lax stems covered in silky woolly rosettes. From midsummer into autumn it bears umbels of pale lavender-pink to deep rose flowers, making it one of the longer-flowering Androsace species. Ideal for dry walls, rock garden cascading positions, and raised troughs.

Cold limit: USDA 4–7 · RHS H6 (-15°C to 22°C)

Watch for — Stem and crown rot in winter: The trailing stems are vulnerable to rot where they contact persistently wet soil in winter. Improve drainage, remove dead or damaged stems promptly, and apply a grit mulch beneath the foliage to reduce soil contact and moisture retention.

What woolly rock jasmine's hardiness rating actually means

Yes — woolly rock jasmine is genuinely cold hardy. Rated RHS H6 and USDA 4–7, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 4–7 — 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 −20 to −15 °C. Woolly Rock Jasmine is built for winter — once established it takes hard frost and snow in its stride.

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

It tolerates winter lows to about −20 to −15 °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 woolly rock jasmine go outside or overwinter — and where?

Plant it out within USDA 4–7 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 woolly rock jasmine can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Woolly Rock Jasmine hardiness — frequently asked questions

Is woolly rock jasmine cold hardy?

Yes — woolly rock jasmine is genuinely cold hardy. Rated RHS H6 and USDA 4–7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Woolly Rock Jasmine is hardy across USDA 4–7; 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 woolly rock jasmine can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Woolly Rock Jasmine is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is woolly rock jasmine?

Woolly Rock Jasmine is rated USDA 4–7 and RHS H6 — Hardy throughout the UK and northern Europe.

Can woolly rock jasmine survive winter outside?

Plant it out within USDA 4–7 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 woolly rock jasmine below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.