Cold hardiness & minimum temperature

Is London Pride (Saxifraga umbrosa)cold hardy? Hardiness zone & min temp

Also called London Pride, St Patrick's Cabbage, Prattling Parnell.

More about london pride

About London Pride

Saxifraga umbrosa · also called London Pride, St Patrick's Cabbage · flowering

London Pride is a tough, shade-tolerant evergreen perennial forming rosettes of leathery, spoon-shaped leaves. In late spring it sends up airy sprays of tiny pale-pink flowers on slender red stems. Reliable and low-maintenance, it thrives in moist, well-drained soil and is an excellent ground-cover for shady borders and rockeries.

Cold limit: USDA 6–9 · RHS H6 (0–22°C)

Watch for — Crown rot: Caused by waterlogged soil, particularly over winter. Ensure free drainage; avoid planting crowns below soil level. Gritty soil and raised beds reduce the risk significantly.

What london pride's hardiness rating actually means

Yes — london pride is genuinely cold hardy. Rated RHS H6 and USDA 6–9, 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 6–9 — 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. London Pride is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for london pride 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 london pride go outside or overwinter — and where?

Plant it out within USDA 6–9 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 london pride can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

London Pride hardiness — frequently asked questions

Is london pride cold hardy?

Yes — london pride is genuinely cold hardy. Rated RHS H6 and USDA 6–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. London Pride is hardy across USDA 6–9; 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 london pride can survive?

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

What hardiness zone is london pride?

London Pride is rated USDA 6–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can london pride survive winter outside?

Plant it out within USDA 6–9 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 london pride 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.