Cold hardiness & minimum temperature

Is Wheat cockscomb (Celosia spicata)cold hardy? Hardiness zone & min temp

Also called Wheat cockscomb, Flamingo feather, Spicate cockscomb.

More about wheat cockscomb

About Wheat cockscomb

Celosia spicata · also called Wheat cockscomb, Flamingo feather · flowering

Wheat cockscomb is a heat-loving annual producing slender, wheat-like spikes of pink, rose, or white flowers from summer to frost. Grow it in full sun with well-drained soil, water moderately, and allow the topsoil to dry between waterings. It thrives in hot weather and makes excellent fresh or dried cut flowers.

Cold limit: USDA 10–12 (grown as annual in zones 2–9) · RHS H1c (18–35°C)

What wheat cockscomb's hardiness rating actually means

Hardiness works differently for wheat cockscomb: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". Its RHS rating of H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 10–12 (grown as annual in zones 2–9) — 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

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

Concretely, for wheat cockscomb as it gets too cold:

Light frost (around 0 to −2 °C) damages or kills tender summer crops outright; cold-hardy types take a few degrees of frost.
The plant does not "survive winter" — its life cycle simply ends, by design, when frost arrives or it finishes cropping.
A surprise late spring frost can also kill young transplants set out too early, before the season even starts.

Can wheat cockscomb go outside or overwinter — and where?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost.
In short-season zones, start it indoors or under cover to stretch the effective growing window.
Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

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 wheat cockscomb can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Frost protection for borderline wheat cockscomb

Wheat cockscomb is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks.
Have row cover ready for an unexpected late spring or early autumn frost.
Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.

Wheat cockscomb hardiness — frequently asked questions

Is wheat cockscomb cold hardy?

Hardiness works differently for wheat cockscomb: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". A seasonal crop, not a perennial. Wheat cockscomb is grown 10–12 (grown as annual in zones 2–9); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature wheat cockscomb can survive?

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

What hardiness zone is wheat cockscomb?

Wheat cockscomb is rated USDA 10–12 (grown as annual in zones 2–9) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can wheat cockscomb survive winter outside?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost. In short-season zones, start it indoors or under cover to stretch the effective growing window. Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

How do I protect wheat cockscomb from frost?

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks. Have row cover ready for an unexpected late spring or early autumn frost. Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.