Cold hardiness & minimum temperature

Is Leaf Celery (Apium graveolens var. secalinum)cold hardy? Hardiness zone & min temp

Also called Leaf Celery, Chinese Celery, Cutting Celery, Smallage.

More about leaf celery

About Leaf Celery

Apium graveolens var. secalinum · also called Leaf Celery, Chinese Celery · herb

Leaf Celery is a heritage variety of celery grown primarily for its abundant, intensely flavoured leaves rather than thick stalks. Far more tolerant of heat, cold, and neglect than stalk celery, it is treated like a cut-and-come-again herb. The leaves have a concentrated celery flavour ideal for soups, stocks, and Asian cooking.

Cold limit: USDA 3-10 · RHS H4 (5 to 28°C)

Watch for — Bolting in heat: Plants exposed to prolonged temperatures above 26°C or significant day-length increase will run to seed, producing a hollow flower stalk and reducing leaf palatability. Provide afternoon shade in warm regions, maintain soil moisture, and harvest leaves regularly to slow the process. Sow a second crop in late summer for autumn harvest.

What leaf celery's hardiness rating actually means

Yes — leaf celery is genuinely cold hardy. Rated RHS H4 and USDA 3-10, 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 3-10 — 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 −10 to −5 °C. Leaf Celery is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for leaf celery 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 leaf celery go outside or overwinter — and where?

Plant it out within USDA 3-10 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 leaf celery can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Leaf Celery hardiness — frequently asked questions

Is leaf celery cold hardy?

Yes — leaf celery is genuinely cold hardy. Rated RHS H4 and USDA 3-10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Leaf Celery is hardy across USDA 3-10; 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 leaf celery can survive?

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

What hardiness zone is leaf celery?

Leaf Celery is rated USDA 3-10 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can leaf celery survive winter outside?

Plant it out within USDA 3-10 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 leaf celery 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.