Cold hardiness & minimum temperature

Is Ranunculus asiaticus 'Mache' (Ranunculus asiaticus 'Mache')cold hardy? Hardiness zone & min temp

Also called Mache ranunculus, coral pink Persian buttercup.

More about ranunculus asiaticus 'mache'

About Ranunculus asiaticus 'Mache'

Ranunculus asiaticus 'Mache' · also called Mache ranunculus, coral pink Persian buttercup · flowering

Mache is a Japanese-bred Persian buttercup series grown for cutting, with very full, ruffled, rose-like blooms; the coral-pink form is especially popular. Raised from pre-soaked corms, it flowers in spring from autumn or late-winter planting on long, strong stems. Being a buttercup-family plant, it is toxic to cats and dogs if eaten.

Cold limit: USDA 8-10 (cool-season annual or lifted elsewhere) · RHS H3 (7-18°C)

Watch for — Heat-triggered dormancy: Foliage yellows and dies back early once temperatures climb above the low 20s°C. Plant early for a cool growing window and shade from hot afternoon sun.

What ranunculus asiaticus 'mache''s hardiness rating actually means

Hardiness works differently for ranunculus asiaticus 'mache': 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 H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 8-10 (cool-season annual or lifted elsewhere) — 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 ranunculus asiaticus 'mache' 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 ranunculus asiaticus 'mache' 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 ranunculus asiaticus 'mache' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline ranunculus asiaticus 'mache'

Ranunculus asiaticus 'Mache' 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.

Ranunculus asiaticus 'Mache' hardiness — frequently asked questions

Is ranunculus asiaticus 'mache' cold hardy?

Hardiness works differently for ranunculus asiaticus 'mache': 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. Ranunculus asiaticus 'Mache' is grown 8-10 (cool-season annual or lifted elsewhere); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature ranunculus asiaticus 'mache' 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 ranunculus asiaticus 'mache'?

Ranunculus asiaticus 'Mache' is rated USDA 8-10 (cool-season annual or lifted elsewhere) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can ranunculus asiaticus 'mache' 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 ranunculus asiaticus 'mache' 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.