Cold hardiness & minimum temperature

Is English Walnut 'Lara' (Juglans regia 'Lara')cold hardy? Hardiness zone & min temp

Also called Lara walnut.

More about english walnut 'lara'

About English Walnut 'Lara'

Juglans regia 'Lara' · also called Lara walnut · edible

'Lara' is a French-bred English walnut grown widely in Europe and Australia for large, well-sealed, light-coloured kernels and early, heavy lateral bearing. It leafs and crops early, so it needs a frost-free spring, plenty of summer warmth and a polleniser. Vigorous and productive, it comes into bearing young.

Cold limit: USDA 6-9 · RHS H5 (-20 to 38°C)

Watch for — Spring frost on early growth: 'Lara' leafs early, so its tender shoots and catkins can be killed by late frosts; avoid frost-pocket sites and consider overhead protection in marginal areas.

What english walnut 'lara''s hardiness rating actually means

Yes — english walnut 'lara' is genuinely cold hardy. Rated RHS H5 and USDA 6-9, 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 6-9 — 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 −15 to −10 °C. English Walnut 'Lara' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for english walnut 'lara' 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 walnut 'lara' go outside or overwinter — and where?

Plant it out within USDA 6-9 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 english walnut 'lara' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

English Walnut 'Lara' hardiness — frequently asked questions

Is english walnut 'lara' cold hardy?

Yes — english walnut 'lara' is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. English Walnut 'Lara' is hardy across USDA 6-9; 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 english walnut 'lara' can survive?

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

What hardiness zone is english walnut 'lara'?

English Walnut 'Lara' is rated USDA 6-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can english walnut 'lara' survive winter outside?

Plant it out within USDA 6-9 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 english walnut 'lara' 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.