Cold hardiness & minimum temperature

Is Frau Dagmar Hartopp Rose (Rosa 'Frau Dagmar Hartopp')cold hardy? Hardiness zone & min temp

Also called Frau Dagmar Hartopp, Frau Dagmar Hastrup.

More about frau dagmar hartopp rose

About Frau Dagmar Hartopp Rose

Rosa 'Frau Dagmar Hartopp' · also called Frau Dagmar Hartopp, Frau Dagmar Hastrup · flowering

Frau Dagmar Hartopp is a compact rugosa shrub rose with single, silvery soft-pink blooms and creamy stamens that are sweetly scented and repeat from summer to autumn, followed by large round crimson hips. More restrained than most rugosas, with disease-resistant wrinkled foliage colouring in autumn, it suits smaller gardens, low hedging and coastal planting.

Cold limit: USDA 3-9 · RHS H7 (-35 to 30°C)

What frau dagmar hartopp rose's hardiness rating actually means

Yes — frau dagmar hartopp rose is genuinely cold hardy. Rated RHS H7 and USDA 3-9, 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 3-9 — 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 below about −20 °C. Frau Dagmar Hartopp Rose is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for frau dagmar hartopp rose 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 frau dagmar hartopp rose go outside or overwinter — and where?

Plant it out within USDA 3-9 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 frau dagmar hartopp rose can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Frau Dagmar Hartopp Rose hardiness — frequently asked questions

Is frau dagmar hartopp rose cold hardy?

Yes — frau dagmar hartopp rose is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Frau Dagmar Hartopp Rose is hardy across USDA 3-9; 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 frau dagmar hartopp rose can survive?

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

What hardiness zone is frau dagmar hartopp rose?

Frau Dagmar Hartopp Rose is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can frau dagmar hartopp rose survive winter outside?

Plant it out within USDA 3-9 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 frau dagmar hartopp rose 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.