Cold hardiness & minimum temperature

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

Also called Endres cranesbill, French cranesbill.

More about geranium endressii

About Geranium endressii

Geranium endressii · also called Endres cranesbill, French cranesbill · flowering

A reliable, long-flowering cranesbill from the Pyrenees bearing bright rose-pink, trumpet-shaped flowers from early summer well into autumn above fresh green, semi-evergreen foliage. One parent of the popular x oxonianum hybrids, G. endressii is vigorous, shade-tolerant, and easy, spreading by rhizomes to make excellent weed-suppressing groundcover for borders and rough ground.

Cold limit: USDA 4-8 (hardy garden perennial) · RHS H7 (-20 to 27°C)

What geranium endressii's hardiness rating actually means

Yes — geranium endressii is genuinely cold hardy. Rated RHS H7 and USDA 4-8 (hardy garden perennial), 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 4-8 (hardy garden 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 below about −20 °C. Geranium endressii is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 4-8 (hardy garden 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 endressii can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Geranium endressii hardiness — frequently asked questions

Is geranium endressii cold hardy?

Yes — geranium endressii is genuinely cold hardy. Rated RHS H7 and USDA 4-8 (hardy garden perennial), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Geranium endressii is hardy across USDA 4-8 (hardy garden 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 endressii can survive?

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

What hardiness zone is geranium endressii?

Geranium endressii is rated USDA 4-8 (hardy garden perennial) and RHS H7 — Hardy in the severest European continental winters.

Can geranium endressii survive winter outside?

Plant it out within USDA 4-8 (hardy garden 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 endressii 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.