Cold hardiness & minimum temperature

Is Wild Rocket (Diplotaxis tenuifolia)cold hardy? Hardiness zone & min temp

Also called Perennial wall-rocket, Lincoln weed, Sand rocket.

More about wild rocket

About Wild Rocket

Diplotaxis tenuifolia · also called Perennial wall-rocket, Lincoln weed · edible

Wild Rocket is a perennial Mediterranean leaf vegetable with a more intense, peppery flavour than cultivated rocket. Unlike annual salad rocket, it regrows vigorously after cutting. Drought-tolerant and long-lived once established, it thrives in well-drained soil and full sun. Fully edible and pet-safe for dogs and cats.

Cold limit: USDA 6-10 · RHS H5 (5-25°C)

What wild rocket's hardiness rating actually means

Yes — wild rocket is genuinely cold hardy. Rated RHS H5 and USDA 6-10, 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 6-10 — 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. Wild Rocket is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for wild rocket 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 wild rocket go outside or overwinter — and where?

Plant it out within USDA 6-10 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 wild rocket can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Wild Rocket hardiness — frequently asked questions

Is wild rocket cold hardy?

Yes — wild rocket is genuinely cold hardy. Rated RHS H5 and USDA 6-10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Wild Rocket is hardy across USDA 6-10; 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 wild rocket can survive?

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

What hardiness zone is wild rocket?

Wild Rocket is rated USDA 6-10 and RHS H5 — Hardy in most of the UK and in cold winters.

Can wild rocket survive winter outside?

Plant it out within USDA 6-10 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 wild rocket 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.