Cold hardiness & minimum temperature

Is Golden Cliff Stonecrop (Prometheum chrysanthum)cold hardy? Hardiness zone & min temp

Also called Golden Cliff Stonecrop, Rosularia chrysantha.

More about golden cliff stonecrop

About Golden Cliff Stonecrop

Prometheum chrysanthum · also called Golden Cliff Stonecrop, Rosularia chrysantha · houseplant

A slow-growing alpine succulent from rocky slopes and cliffs in Turkey, forming tight mounds of small fleshy rosettes to 3 cm across with velvety, spoon-shaped leaves. Clusters of ivory to pale-yellow flowers with reddish venation appear on upright stems in early summer. Very cold hardy; thrives in full sun with excellent drainage and minimal summer water.

Cold limit: USDA 5–9 · RHS H6 (-29 to 27°C)

What golden cliff stonecrop's hardiness rating actually means

Yes — golden cliff stonecrop is genuinely cold hardy. Rated RHS H6 and USDA 5–9, 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 5–9 — 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 about −20 to −15 °C. Golden Cliff Stonecrop is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for golden cliff stonecrop 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 golden cliff stonecrop go outside or overwinter — and where?

Plant it out within USDA 5–9 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 golden cliff stonecrop can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Golden Cliff Stonecrop hardiness — frequently asked questions

Is golden cliff stonecrop cold hardy?

Yes — golden cliff stonecrop is genuinely cold hardy. Rated RHS H6 and USDA 5–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Golden Cliff Stonecrop is hardy across USDA 5–9; 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 golden cliff stonecrop can survive?

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

What hardiness zone is golden cliff stonecrop?

Golden Cliff Stonecrop is rated USDA 5–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can golden cliff stonecrop survive winter outside?

Plant it out within USDA 5–9 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 golden cliff stonecrop 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.