Cold hardiness & minimum temperature

Is Vitis coignetiae (Vitis coignetiae)cold hardy? Hardiness zone & min temp

Also called crimson glory vine, Japanese crimson grape.

More about vitis coignetiae

About Vitis coignetiae

Vitis coignetiae · also called crimson glory vine, Japanese crimson grape · flowering

Vitis coignetiae, the crimson glory vine, is a spectacular ornamental deciduous climber grown for huge heart-shaped leaves up to 30 cm that blaze crimson, scarlet and orange in autumn. Vigorous tendril climber from Japan and Korea, it carries small inedible black grapes. Holding the RHS Award of Garden Merit, it is grown for foliage drama, not fruit.

Cold limit: USDA 5-9 · RHS H6 (-20 to 30°C)

What vitis coignetiae's hardiness rating actually means

Yes — vitis coignetiae is genuinely cold hardy. Rated RHS H6 and USDA 5-9, 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 5-9 — 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. Vitis coignetiae is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for vitis coignetiae 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 vitis coignetiae go outside or overwinter — and where?

Plant it out within USDA 5-9 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 vitis coignetiae can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Vitis coignetiae hardiness — frequently asked questions

Is vitis coignetiae cold hardy?

Yes — vitis coignetiae is genuinely cold hardy. Rated RHS H6 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Vitis coignetiae is hardy across USDA 5-9; 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 vitis coignetiae can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Vitis coignetiae is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is vitis coignetiae?

Vitis coignetiae is rated USDA 5-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can vitis coignetiae survive winter outside?

Plant it out within USDA 5-9 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 vitis coignetiae 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.