Cold hardiness & minimum temperature

Is English ivy (Hedera helix)cold hardy? Hardiness zone & min temp

Also called common ivy, European ivy.

About English ivy

Hedera helix · also called common ivy, European ivy · houseplant

English ivy is a trailing or climbing evergreen vine that grows happily indoors in cool, bright conditions and is a vigorous outdoor groundcover in mild climates. Variegated cultivars are the most popular indoor forms. Toxic to pets.

Hedera helix is native to Europe and western Asia, a woodland climber adapted to cool, shaded conditions, which is why indoor plants resent hot, dry air.

A fast, self-clinging trailing or climbing evergreen — note that ASPCA lists English ivy as toxic to dogs, cats and horses (triterpenoid saponins/hederagenin), with the foliage more dangerous than the berries, causing vomiting, drooling, abdominal pain and diarrhea.

Cold limit: USDA 4-9 (outdoor hardy) · RHS H5 (hardy throughout UK) (10-21°C)

Sources: aspca.org

What english ivy's hardiness rating actually means

Yes — english ivy is genuinely cold hardy. Rated RHS H5 and USDA 4-9 (outdoor hardy), it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 4-9 (outdoor hardy) — 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 −15 to −10 °C. English ivy is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for english ivy as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 english ivy go outside or overwinter — and where?

Plant it out within USDA 4-9 (outdoor hardy) 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 english ivy can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

English ivy hardiness — frequently asked questions

Is english ivy cold hardy?

Yes — english ivy is genuinely cold hardy. Rated RHS H5 and USDA 4-9 (outdoor hardy), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. English ivy is hardy across USDA 4-9 (outdoor hardy); 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 english ivy can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. English ivy is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is english ivy?

English ivy is rated USDA 4-9 (outdoor hardy) and RHS H5 — Hardy in most of the UK and in cold winters.

Can english ivy survive winter outside?

Plant it out within USDA 4-9 (outdoor hardy) 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 english ivy below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.