Cold hardiness & minimum temperature

Is Purple Kiwi (Actinidia purpurea)cold hardy? Hardiness zone & min temp

Also called Purple Kiwi, Purple-fruited Hardy Kiwi.

More about purple kiwi

About Purple Kiwi

Actinidia purpurea · also called Purple Kiwi, Purple-fruited Hardy Kiwi · edible

Purple Kiwi is a cold-hardy Chinese species producing small, deep-purple or reddish fruits with sweet, smooth-skinned flesh eaten whole. Less widely cultivated than Actinidia arguta, it is valued for its ornamental fruit colour and hardiness. Dioecious; both male and female plants are needed. Grows vigorously on a sturdy trellis in full sun.

Cold limit: USDA 5–9 · RHS H6 (-20 to 35 °C)

Watch for — Late Spring Frost Damage: New spring shoots emerge early and are vulnerable to frost. A sharp late frost can kill the season's growth and eliminate that year's fruit crop. Plant in a frost-sheltered location or provide temporary fleece protection during forecast frosts.

What purple kiwi's hardiness rating actually means

Yes — purple kiwi 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. Purple Kiwi is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for purple kiwi 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 purple kiwi 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 purple kiwi can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Purple Kiwi hardiness — frequently asked questions

Is purple kiwi cold hardy?

Yes — purple kiwi 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. Purple Kiwi 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 purple kiwi can survive?

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

What hardiness zone is purple kiwi?

Purple Kiwi is rated USDA 5–9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can purple kiwi 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 purple kiwi 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.