Cold hardiness & minimum temperature

Is Hylotelephium spectabile 'Brilliant' (Hylotelephium spectabile 'Brilliant')cold hardy? Hardiness zone & min temp

Also called Brilliant showy stonecrop, ice plant.

More about hylotelephium spectabile 'brilliant'

About Hylotelephium spectabile 'Brilliant'

Hylotelephium spectabile 'Brilliant' · also called Brilliant showy stonecrop, ice plant · flowering

'Brilliant' is a showy stonecrop forming a tidy mound of fleshy blue-green leaves topped from late summer by domed heads of vivid rose-pink star flowers that blaze with pollinators. An easy, drought-proof border perennial, it thrives on neglect in poor, well-drained soil and full sun, and its seed heads add winter structure.

Cold limit: USDA 3-9 · RHS H7 (-34 to 30°C)

Watch for — Root and crown rot: The chief killer, caused by wet or compacted soil over winter. Sharpen drainage with grit and avoid waterlogging.

What hylotelephium spectabile 'brilliant''s hardiness rating actually means

Yes — hylotelephium spectabile 'brilliant' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 3-9 — 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 below about −20 °C. Hylotelephium spectabile 'Brilliant' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for hylotelephium spectabile 'brilliant' as it gets too cold:

It tolerates winter lows to about −20 °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 hylotelephium spectabile 'brilliant' go outside or overwinter — and where?

Plant it out within USDA 3-9 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 hylotelephium spectabile 'brilliant' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Hylotelephium spectabile 'Brilliant' hardiness — frequently asked questions

Is hylotelephium spectabile 'brilliant' cold hardy?

Yes — hylotelephium spectabile 'brilliant' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Hylotelephium spectabile 'Brilliant' is hardy across USDA 3-9; 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 hylotelephium spectabile 'brilliant' can survive?

Minimum survivable temperature is roughly below about −20 °C. Hylotelephium spectabile 'Brilliant' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is hylotelephium spectabile 'brilliant'?

Hylotelephium spectabile 'Brilliant' is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can hylotelephium spectabile 'brilliant' survive winter outside?

Plant it out within USDA 3-9 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 hylotelephium spectabile 'brilliant' below its minimum temperature?

It tolerates winter lows to about −20 °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.