Cold hardiness & minimum temperature

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

Also called Tanna burnet.

More about sanguisorba 'tanna'

About Sanguisorba 'Tanna'

Sanguisorba 'Tanna' · also called Tanna burnet · flowering

A compact, well-behaved burnet bearing dark crimson-red drumstick flower heads on slender stems through summer, above neat mounds of blue-green pinnate foliage. More restrained than great burnet at around 60 cm, 'Tanna' fits smaller borders and gravel gardens. Hardy and pollinator-friendly, it adds fine texture and rich colour to naturalistic and contemporary planting schemes.

Cold limit: USDA 4-8 · RHS H7 (-25 to 26°C)

Watch for — Crown rot in wet winters: Crowns can rot in waterlogged winter soil; ensure free drainage, particularly on heavy ground.

What sanguisorba 'tanna''s hardiness rating actually means

Yes — sanguisorba 'tanna' 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. Sanguisorba 'Tanna' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for sanguisorba 'tanna' 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 'tanna' 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 sanguisorba 'tanna' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Sanguisorba 'Tanna' hardiness — frequently asked questions

Is sanguisorba 'tanna' cold hardy?

Yes — sanguisorba 'tanna' 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. Sanguisorba 'Tanna' 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 sanguisorba 'tanna' can survive?

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

What hardiness zone is sanguisorba 'tanna'?

Sanguisorba 'Tanna' is rated USDA 4-8 and RHS H7 — Hardy in the severest European continental winters.

Can sanguisorba 'tanna' 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 sanguisorba 'tanna' 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.