Cold hardiness & minimum temperature

Is Britt-Marie Crawford Ligularia (Ligularia dentata 'Britt-Marie Crawford')cold hardy? Hardiness zone & min temp

Also called Britt-Marie Crawford ligularia, dark-leaved goldenray.

More about britt-marie crawford ligularia

About Britt-Marie Crawford Ligularia

Ligularia dentata 'Britt-Marie Crawford' · also called Britt-Marie Crawford ligularia, dark-leaved goldenray · flowering

'Britt-Marie Crawford' is a dramatic moisture-loving perennial grown for huge rounded leaves of deep chocolate-maroon, glossy above and beetroot-purple beneath, topped in late summer by bold clusters of orange-yellow daisy flowers. A statement plant for damp shade, pond margins and bog gardens, its dark foliage holds colour best in cooler, consistently moist conditions.

Cold limit: USDA 4-8 (hardy garden perennial) · RHS H7 (-29 to 24°C)

What britt-marie crawford ligularia's hardiness rating actually means

Yes — britt-marie crawford ligularia 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. Britt-Marie Crawford Ligularia is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for britt-marie crawford ligularia 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 britt-marie crawford ligularia 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 britt-marie crawford ligularia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Britt-Marie Crawford Ligularia hardiness — frequently asked questions

Is britt-marie crawford ligularia cold hardy?

Yes — britt-marie crawford ligularia 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. Britt-Marie Crawford Ligularia 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 britt-marie crawford ligularia can survive?

Minimum survivable temperature is roughly below about −20 °C. Britt-Marie Crawford Ligularia is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is britt-marie crawford ligularia?

Britt-Marie Crawford Ligularia is rated USDA 4-8 (hardy garden perennial) and RHS H7 — Hardy in the severest European continental winters.

Can britt-marie crawford ligularia 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 britt-marie crawford ligularia 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.