Cold hardiness & minimum temperature

Is Cecile Brunner Climbing Rose (Rosa 'Cecile Brunner')cold hardy? Hardiness zone & min temp

Also called Climbing Cecile Brunner, Sweetheart Rose, Mignon.

More about cecile brunner climbing rose

About Cecile Brunner Climbing Rose

Rosa 'Cecile Brunner' · also called Climbing Cecile Brunner, Sweetheart Rose · flowering

The climbing form of Cecile Brunner, known as the Sweetheart Rose, is a hugely vigorous, almost thornless polyantha climber. It smothers itself in dainty, shell-pink buds opening to small, sweetly scented double blooms in great trusses. Mainly flowering in one abundant early-summer flush with occasional later bloom, it readily covers walls, large pergolas and even trees.

Cold limit: USDA 5-10 (outdoor garden rose) · RHS H6 (-23 to 32°C)

What cecile brunner climbing rose's hardiness rating actually means

Yes — cecile brunner climbing rose is genuinely cold hardy. Rated RHS H6 and USDA 5-10 (outdoor garden rose), 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 5-10 (outdoor garden rose) — 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. Cecile Brunner Climbing Rose is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for cecile brunner climbing rose 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 cecile brunner climbing rose go outside or overwinter — and where?

Plant it out within USDA 5-10 (outdoor garden rose) 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 cecile brunner climbing rose can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Cecile Brunner Climbing Rose hardiness — frequently asked questions

Is cecile brunner climbing rose cold hardy?

Yes — cecile brunner climbing rose is genuinely cold hardy. Rated RHS H6 and USDA 5-10 (outdoor garden rose), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Cecile Brunner Climbing Rose is hardy across USDA 5-10 (outdoor garden rose); 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 cecile brunner climbing rose can survive?

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

What hardiness zone is cecile brunner climbing rose?

Cecile Brunner Climbing Rose is rated USDA 5-10 (outdoor garden rose) and RHS H6 — Hardy throughout the UK and northern Europe.

Can cecile brunner climbing rose survive winter outside?

Plant it out within USDA 5-10 (outdoor garden rose) 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 cecile brunner climbing rose 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.