Cold hardiness & minimum temperature

Is Wisteria sinensis (Wisteria sinensis)cold hardy? Hardiness zone & min temp

Also called Chinese wisteria, Chinese kidney bean.

More about wisteria sinensis

About Wisteria sinensis

Wisteria sinensis · also called Chinese wisteria, Chinese kidney bean · flowering

Chinese wisteria is a powerful deciduous climber that drapes walls and pergolas in fragrant lilac-blue racemes in late spring, mostly before the leaves unfurl. It needs full sun, deep fertile soil and a strong support, plus twice-yearly pruning to flower well. All parts, especially the seeds and pods, are toxic to cats and dogs.

Cold limit: USDA 5-9 (outdoor garden climber; can be invasive in parts of the US Southeast) · RHS H6 (hardy throughout most of the UK) (-20 to 30°C)

Watch for — Failure to flower after good years: Usually loss of flower buds to a hard late frost, or hard pruning at the wrong time that removes the short flowering spurs.

What wisteria sinensis's hardiness rating actually means

Yes — wisteria sinensis is genuinely cold hardy. Rated RHS H6 and USDA 5-9 (outdoor garden climber; can be invasive in parts of the US Southeast), 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 (outdoor garden climber; can be invasive in parts of the US Southeast) — 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. Wisteria sinensis is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for wisteria sinensis 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 wisteria sinensis go outside or overwinter — and where?

Plant it out within USDA 5-9 (outdoor garden climber; can be invasive in parts of the US Southeast) 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 wisteria sinensis can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Wisteria sinensis hardiness — frequently asked questions

Is wisteria sinensis cold hardy?

Yes — wisteria sinensis is genuinely cold hardy. Rated RHS H6 and USDA 5-9 (outdoor garden climber; can be invasive in parts of the US Southeast), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Wisteria sinensis is hardy across USDA 5-9 (outdoor garden climber; can be invasive in parts of the US Southeast); 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 wisteria sinensis can survive?

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

What hardiness zone is wisteria sinensis?

Wisteria sinensis is rated USDA 5-9 (outdoor garden climber; can be invasive in parts of the US Southeast) and RHS H6 — Hardy throughout the UK and northern Europe.

Can wisteria sinensis survive winter outside?

Plant it out within USDA 5-9 (outdoor garden climber; can be invasive in parts of the US Southeast) 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 wisteria sinensis 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.