Cold hardiness & minimum temperature

Is Wickwar Flame heather (Calluna vulgaris 'Wickwar Flame')cold hardy? Hardiness zone & min temp

Also called Wickwar Flame heather, Scotch heather, ling.

More about wickwar flame heather

About Wickwar Flame heather

Calluna vulgaris 'Wickwar Flame' · also called Wickwar Flame heather, Scotch heather · flowering

Wickwar Flame heather is a compact evergreen shrub prized for its year-round colour: golden-yellow foliage that turns rich orange-red in winter, with lilac-pink flowers in late summer. It thrives in acidic, well-drained soil and full sun. Hardy and drought-tolerant once established, it is ideal for heather gardens, rock gardens, and ground cover schemes.

Cold limit: USDA 4-7 · RHS H7 (-20 to 25°C)

What wickwar flame heather's hardiness rating actually means

Yes — wickwar flame heather is genuinely cold hardy. Rated RHS H7 and USDA 4-7, 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 4-7 — 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. Wickwar Flame heather is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for wickwar flame heather 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 wickwar flame heather go outside or overwinter — and where?

Plant it out within USDA 4-7 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 wickwar flame heather can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Wickwar Flame heather hardiness — frequently asked questions

Is wickwar flame heather cold hardy?

Yes — wickwar flame heather is genuinely cold hardy. Rated RHS H7 and USDA 4-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Wickwar Flame heather is hardy across USDA 4-7; 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 wickwar flame heather can survive?

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

What hardiness zone is wickwar flame heather?

Wickwar Flame heather is rated USDA 4-7 and RHS H7 — Hardy in the severest European continental winters.

Can wickwar flame heather survive winter outside?

Plant it out within USDA 4-7 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 wickwar flame heather 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.