Cold hardiness & minimum temperature

Is Tasteless Stonecrop (Sedum sexangulare)cold hardy? Hardiness zone & min temp

Also called Tasteless Stonecrop, Six-Angled Stonecrop, Watch-Chain Stonecrop.

More about tasteless stonecrop

About Tasteless Stonecrop

Sedum sexangulare · also called Tasteless Stonecrop, Six-Angled Stonecrop · houseplant

Sedum sexangulare is a minute, mat-forming stonecrop with tightly spiralled, cylindrical bright-green leaves arranged in six distinct ranks along the stems, resembling tiny watch chains. Cheerful yellow star flowers appear in early summer. Grown as a novelty houseplant or alpine, it needs minimal water, excellent drainage, and as much sun as possible.

Cold limit: USDA 4-9 · RHS H6 (-20 to 28°C)

Watch for — Etiolation (stretching): Stems lengthen and lose the tight six-ranked arrangement in insufficient light. Move to the brightest available windowsill or supplement with a grow light, especially in winter.

What tasteless stonecrop's hardiness rating actually means

Yes — tasteless stonecrop is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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. Tasteless Stonecrop is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 4-9 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 tasteless stonecrop can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Tasteless Stonecrop hardiness — frequently asked questions

Is tasteless stonecrop cold hardy?

Yes — tasteless stonecrop is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Tasteless Stonecrop is hardy across USDA 4-9; 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 tasteless stonecrop can survive?

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

What hardiness zone is tasteless stonecrop?

Tasteless Stonecrop is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can tasteless stonecrop survive winter outside?

Plant it out within USDA 4-9 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 tasteless 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.