Cold hardiness & minimum temperature

Is Lydian Stonecrop (Sedum lydium)cold hardy? Hardiness zone & min temp

Also called Lydian stonecrop, Mossy stonecrop, Least stonecrop.

More about lydian stonecrop

About Lydian Stonecrop

Sedum lydium · also called Lydian stonecrop, Mossy stonecrop · flowering

Sedum lydium is a mat-forming evergreen succulent native to the mountains of Turkey and the eastern Mediterranean, where it grows on rocky scree and cliff faces. It thrives in full sun with sharply drained, lean soil and demands very little water once established — overwatering is the most common cause of failure. Foliage is typically bright green but flushes a handsome red in autumn and winter drought stress. It is considered non-toxic to cats and dogs.

Cold limit: USDA 5-9 · RHS H4 (-10 to 35°C)

What lydian stonecrop's hardiness rating actually means

Yes — lydian stonecrop is genuinely cold hardy. Rated RHS H4 and USDA 5-9, 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 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 −10 to −5 °C. Lydian Stonecrop is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for lydian stonecrop 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 lydian 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 lydian stonecrop can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Lydian Stonecrop hardiness — frequently asked questions

Is lydian stonecrop cold hardy?

Yes — lydian stonecrop is genuinely cold hardy. Rated RHS H4 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Lydian 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 lydian stonecrop can survive?

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

What hardiness zone is lydian stonecrop?

Lydian Stonecrop is rated USDA 5-9 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can lydian 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 lydian stonecrop 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.