Cold hardiness & minimum temperature

Is Common Witch Hazel 'Arnold Promise' (Hamamelis × intermedia 'Arnold Promise')cold hardy? Hardiness zone & min temp

Also called Witch Hazel.

More about common witch hazel 'arnold promise'

About Common Witch Hazel 'Arnold Promise'

Hamamelis × intermedia 'Arnold Promise' · also called Witch Hazel · flowering

'Arnold Promise' is a late-winter-flowering witch hazel whose bare branches erupt with spidery, fragrant bright-yellow flowers in February and March, followed by good orange-red autumn leaf colour. A hardy deciduous shrub for acidic, moist, well-drained soil and open sun or light shade, it brings scent and colour to the dormant garden.

Cold limit: USDA 5-8 · RHS H6 (-25 to 27°C)

What common witch hazel 'arnold promise''s hardiness rating actually means

Yes — common witch hazel 'arnold promise' is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 5-8 — 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 about −20 to −15 °C. Common Witch Hazel 'Arnold Promise' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for common witch hazel 'arnold promise' as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 common witch hazel 'arnold promise' go outside or overwinter — and where?

Plant it out within USDA 5-8 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 common witch hazel 'arnold promise' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Common Witch Hazel 'Arnold Promise' hardiness — frequently asked questions

Is common witch hazel 'arnold promise' cold hardy?

Yes — common witch hazel 'arnold promise' is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Common Witch Hazel 'Arnold Promise' is hardy across USDA 5-8; 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 common witch hazel 'arnold promise' can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Common Witch Hazel 'Arnold Promise' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is common witch hazel 'arnold promise'?

Common Witch Hazel 'Arnold Promise' is rated USDA 5-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can common witch hazel 'arnold promise' survive winter outside?

Plant it out within USDA 5-8 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 common witch hazel 'arnold promise' below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.