Cold hardiness & minimum temperature

Is Devil's-bit Scabious (Succisa pratensis)cold hardy? Hardiness zone & min temp

Also called Devil's-bit Scabious, Devil's-bit, Ofbit.

More about devil's-bit scabious

About Devil's-bit Scabious

Succisa pratensis · also called Devil's-bit Scabious, Devil's-bit · flowering

Devil's-bit scabious is a rhizomatous herbaceous perennial native to damp meadows, fens, and open woodland in Europe and western Asia. It thrives in moist, moderately fertile soils in full sun or light shade, and its pincushion-like blue-purple flowerheads are an important late-summer nectar source, especially for the marsh fritillary butterfly. The key care fact is that it requires consistently moist soil throughout the growing season and dislikes drought. No significant toxicity to cats or dogs has been recorded; classified mildly-toxic as a precaution since it is absent from ASPCA listings.

Cold limit: USDA 4-8 · RHS H7 (-25 to 22°C)

What devil's-bit scabious's hardiness rating actually means

Yes — devil's-bit scabious is genuinely cold hardy. Rated RHS H7 and USDA 4-8, 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 — 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. Devil's-bit Scabious is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for devil's-bit scabious 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 devil's-bit scabious go outside or overwinter — and where?

Plant it out within USDA 4-8 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 devil's-bit scabious can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Devil's-bit Scabious hardiness — frequently asked questions

Is devil's-bit scabious cold hardy?

Yes — devil's-bit scabious is genuinely cold hardy. Rated RHS H7 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Devil's-bit Scabious is hardy across USDA 4-8; 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 devil's-bit scabious can survive?

Minimum survivable temperature is roughly below about −20 °C. Devil's-bit Scabious is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is devil's-bit scabious?

Devil's-bit Scabious is rated USDA 4-8 and RHS H7 — Hardy in the severest European continental winters.

Can devil's-bit scabious survive winter outside?

Plant it out within USDA 4-8 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 devil's-bit scabious 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.