Cold hardiness & minimum temperature

Is Belgian Endive (Witloof) (Cichorium intybus var. foliosum 'Witloof')cold hardy? Hardiness zone & min temp

Also called Belgian endive, witloof chicory, chicon.

More about belgian endive (witloof)

About Belgian Endive (Witloof)

Cichorium intybus var. foliosum 'Witloof' · also called Belgian endive, witloof chicory · edible

Belgian endive, or witloof, is a two-stage chicory: leafy plants are grown all summer to build a fat taproot, then lifted and forced in darkness to produce pale, tightly furled 'chicons'. Forcing without light keeps the leaves blanched, crisp and only gently bitter. A classic cool-season project for autumn and winter.

Cold limit: USDA Field stage hardy to light frost; force indoors at 10-18°C · RHS H4 (10 to 18°C (forcing))

Watch for — Rot during forcing: Overly wet or warm forcing conditions rot the chicons before they firm up. Keep the medium just moist and the temperature around 10-18°C with some ventilation.

What belgian endive (witloof)'s hardiness rating actually means

Yes — belgian endive (witloof) is genuinely cold hardy. Rated RHS H4 and USDA Field stage hardy to light frost; force indoors at 10-18°C, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA Field stage hardy to light frost; force indoors at 10-18°C — 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 −10 to −5 °C. Belgian Endive (Witloof) is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for belgian endive (witloof) as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 belgian endive (witloof) go outside or overwinter — and where?

Plant it out within USDA Field stage hardy to light frost; force indoors at 10-18°C 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 belgian endive (witloof) can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Belgian Endive (Witloof) hardiness — frequently asked questions

Is belgian endive (witloof) cold hardy?

Yes — belgian endive (witloof) is genuinely cold hardy. Rated RHS H4 and USDA Field stage hardy to light frost; force indoors at 10-18°C, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Belgian Endive (Witloof) is hardy across USDA Field stage hardy to light frost; force indoors at 10-18°C; 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 belgian endive (witloof) can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Belgian Endive (Witloof) is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is belgian endive (witloof)?

Belgian Endive (Witloof) is rated USDA Field stage hardy to light frost; force indoors at 10-18°C and RHS H4 — Hardy in an average winter across much of the temperate world.

Can belgian endive (witloof) survive winter outside?

Plant it out within USDA Field stage hardy to light frost; force indoors at 10-18°C 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 belgian endive (witloof) below its minimum temperature?

It tolerates winter lows to about −10 to −5 °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.