Cold hardiness & minimum temperature

Is Sanguisorba menziesii (Sanguisorba menziesii)cold hardy? Hardiness zone & min temp

Also called Menzies' burnet, Alaska burnet.

More about sanguisorba menziesii

About Sanguisorba menziesii

Sanguisorba menziesii · also called Menzies' burnet, Alaska burnet · flowering

An early-flowering burnet from northern wetlands bearing plump, deep wine-red bottlebrush flower heads from late spring above bold, glaucous blue-green pinnate foliage. Vigorous and showy, Menzies' burnet reaches around 1 m and excels in damp, sunny borders. Hardy and much loved by bees, it lends strong colour and architectural form to naturalistic plantings.

Cold limit: USDA 3-8 · RHS H7 (-30 to 24°C)

What sanguisorba menziesii's hardiness rating actually means

Yes — sanguisorba menziesii is genuinely cold hardy. Rated RHS H7 and USDA 3-8, 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 3-8 — 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. Sanguisorba menziesii is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for sanguisorba menziesii 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 sanguisorba menziesii go outside or overwinter — and where?

Plant it out within USDA 3-8 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 sanguisorba menziesii can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Sanguisorba menziesii hardiness — frequently asked questions

Is sanguisorba menziesii cold hardy?

Yes — sanguisorba menziesii is genuinely cold hardy. Rated RHS H7 and USDA 3-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Sanguisorba menziesii is hardy across USDA 3-8; 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 sanguisorba menziesii can survive?

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

What hardiness zone is sanguisorba menziesii?

Sanguisorba menziesii is rated USDA 3-8 and RHS H7 — Hardy in the severest European continental winters.

Can sanguisorba menziesii survive winter outside?

Plant it out within USDA 3-8 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 sanguisorba menziesii 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.