Cold hardiness & minimum temperature

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

Also called London Pride, None-so-Pretty, St Patrick's Cabbage hybrid.

More about london pride

About London Pride

Saxifraga urbium · also called London Pride, None-so-Pretty · flowering

London Pride is a tough, semi-evergreen perennial forming dense rosettes of rounded, leathery leaves. In late spring it sends up airy 30 cm stems bearing delicate pink-flushed white star-shaped flowers. Exceptionally shade and pollution tolerant, it thrives in urban gardens, rockeries, and wall crevices, spreading slowly by stolons.

Cold limit: USDA 5-8 · RHS H5 (-15 to 25°C)

Watch for — Vine weevil grub damage: Creamy-white grubs feed on roots through winter, causing plants to suddenly wilt and collapse. Apply nematode biological controls (Steinernema kraussei) to moist soil in autumn when soil temperature is above 5°C.

What london pride's hardiness rating actually means

Yes — london pride is genuinely cold hardy. Rated RHS H5 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 5-8 — 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 −15 to −10 °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 −15 to −10 °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 5-8 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 H5 figure above.

London Pride hardiness — frequently asked questions

Is london pride cold hardy?

Yes — london pride is genuinely cold hardy. Rated RHS H5 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. London Pride is hardy across USDA 5-8; 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 −15 to −10 °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 5-8 and RHS H5 — Hardy in most of the UK and in cold winters.

Can london pride survive winter outside?

Plant it out within USDA 5-8 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 −15 to −10 °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.