Cold hardiness & minimum temperature

Is Geranium renardii (Geranium renardii)cold hardy? Hardiness zone & min temp

Also called Renard's cranesbill, Caucasian cranesbill.

More about geranium renardii

About Geranium renardii

Geranium renardii · also called Renard's cranesbill, Caucasian cranesbill · flowering

Renard's cranesbill is a compact Caucasian perennial grown as much for its distinctive sage-green, velvety, deeply veined foliage as its flowers. In early summer it bears white to pale lavender blooms boldly net-veined in violet-purple. Forming neat, slow-spreading rosettes, it suits sunny, well-drained sites, edges and rockeries, and dies back over winter.

Cold limit: USDA 5-8 (outdoor perennial) · RHS H5 (-23 to 27°C)

What geranium renardii's hardiness rating actually means

Yes — geranium renardii is genuinely cold hardy. Rated RHS H5 and USDA 5-8 (outdoor perennial), 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 (outdoor perennial) — 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. Geranium renardii is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for geranium renardii 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 geranium renardii go outside or overwinter — and where?

Plant it out within USDA 5-8 (outdoor perennial) 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 geranium renardii can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Geranium renardii hardiness — frequently asked questions

Is geranium renardii cold hardy?

Yes — geranium renardii is genuinely cold hardy. Rated RHS H5 and USDA 5-8 (outdoor perennial), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Geranium renardii is hardy across USDA 5-8 (outdoor perennial); 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 geranium renardii can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Geranium renardii is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is geranium renardii?

Geranium renardii is rated USDA 5-8 (outdoor perennial) and RHS H5 — Hardy in most of the UK and in cold winters.

Can geranium renardii survive winter outside?

Plant it out within USDA 5-8 (outdoor perennial) 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 geranium renardii 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.