Cold hardiness & minimum temperature

Is Diana Clare Pulmonaria (Pulmonaria 'Diana Clare')cold hardy? Hardiness zone & min temp

Also called Diana Clare lungwort, silver lungwort.

More about diana clare pulmonaria

About Diana Clare Pulmonaria

Pulmonaria 'Diana Clare' · also called Diana Clare lungwort, silver lungwort · flowering

'Diana Clare' is an award-winning lungwort with long, almost wholly silver leaves and early spring flowers that open violet-pink and deepen to rich blue-violet. It forms vigorous, weed-suppressing clumps for moist shade. Pulmonaria isn't individually ASPCA-listed, so treat it with caution around pets.

Cold limit: USDA 4-8 · RHS H7 (-28 to 24°C)

What diana clare pulmonaria's hardiness rating actually means

Yes — diana clare pulmonaria 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. Diana Clare Pulmonaria is built for winter — once established it takes hard frost and snow in its stride.

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

Diana Clare Pulmonaria hardiness — frequently asked questions

Is diana clare pulmonaria cold hardy?

Yes — diana clare pulmonaria 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. Diana Clare Pulmonaria 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 diana clare pulmonaria can survive?

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

What hardiness zone is diana clare pulmonaria?

Diana Clare Pulmonaria is rated USDA 4-8 and RHS H7 — Hardy in the severest European continental winters.

Can diana clare pulmonaria 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 diana clare pulmonaria 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.