Cold hardiness & minimum temperature

Is Sedum dasyphyllum (Sedum dasyphyllum)cold hardy? Hardiness zone & min temp

Also called Corsican stonecrop, thick-leaved stonecrop.

More about sedum dasyphyllum

About Sedum dasyphyllum

Sedum dasyphyllum · also called Corsican stonecrop, thick-leaved stonecrop · houseplant

Sedum dasyphyllum is a low, creeping stonecrop with tiny, plump blue-grey leaves often flushed lavender or pink, forming dense ground-hugging mats. Native to Mediterranean rocks, it is cold-hardy, drought-tolerant, and roots readily from dropped leaves. Topped by small white star flowers in summer, it suits troughs, walls, and green roofs in full sun and sharp soil.

Cold limit: USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot) · RHS H4 (-12 to 27°C)

Watch for — Rot from overwatering: The tiny leaves and shallow roots rot fast in damp soil, the main cause of failure. Plant in a very gritty mix, water only when fully dry, and keep sparing in winter.

What sedum dasyphyllum's hardiness rating actually means

Yes — sedum dasyphyllum is genuinely cold hardy. Rated RHS H4 and USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot), it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot) — 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 −10 to −5 °C. Sedum dasyphyllum is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for sedum dasyphyllum as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 sedum dasyphyllum go outside or overwinter — and where?

Plant it out within USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot) 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 sedum dasyphyllum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Sedum dasyphyllum hardiness — frequently asked questions

Is sedum dasyphyllum cold hardy?

Yes — sedum dasyphyllum is genuinely cold hardy. Rated RHS H4 and USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Sedum dasyphyllum is hardy across USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot); 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 sedum dasyphyllum can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Sedum dasyphyllum is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is sedum dasyphyllum?

Sedum dasyphyllum is rated USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot) and RHS H4 — Hardy in an average winter across much of the temperate world.

Can sedum dasyphyllum survive winter outside?

Plant it out within USDA 6-9 (hardy outdoors in milder zones; grow indoors in a cool, very bright spot) 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 sedum dasyphyllum below its minimum temperature?

It tolerates winter lows to about −10 to −5 °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.