Cold hardiness & minimum temperature

Is Diascia 'Wink Coral Pink' (Diascia × hybrida 'Wink Coral Pink')cold hardy? Hardiness zone & min temp

Also called Wink Coral Pink Diascia, Coral Twinspur.

More about diascia 'wink coral pink'

About Diascia 'Wink Coral Pink'

Diascia × hybrida 'Wink Coral Pink' · also called Wink Coral Pink Diascia, Coral Twinspur · flowering

'Wink Coral Pink' is a free-flowering hybrid twinspur smothered in small spurred coral-pink blooms over neat foliage from late spring to autumn. Part of the well-branched Wink series bred for baskets and containers, it flowers heavily in cool to mild weather, prefers sun with steady moisture and reblooms vigorously when sheared after the first flush.

Cold limit: USDA 8-9 (usually grown as a cool-season annual; may overwinter in mild areas) · RHS H4 (10-24°C)

Watch for — Flowering stalls in heat: High summer temperatures pause blooming and the plant fades. Trim back, keep moist, and flowering rebounds as the weather cools.

What diascia 'wink coral pink''s hardiness rating actually means

Hardiness works differently for diascia 'wink coral pink': 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 H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 8-9 (usually grown as a cool-season annual; may overwinter in mild areas) — 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 diascia 'wink coral pink' 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 diascia 'wink coral pink' 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 diascia 'wink coral pink' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline diascia 'wink coral pink'

Diascia 'Wink Coral Pink' 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.

Diascia 'Wink Coral Pink' hardiness — frequently asked questions

Is diascia 'wink coral pink' cold hardy?

Hardiness works differently for diascia 'wink coral pink': 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. Diascia 'Wink Coral Pink' is grown 8-9 (usually grown as a cool-season annual; may overwinter in mild areas); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature diascia 'wink coral pink' 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 diascia 'wink coral pink'?

Diascia 'Wink Coral Pink' is rated USDA 8-9 (usually grown as a cool-season annual; may overwinter in mild areas) and RHS H4 — Hardy in an average winter across much of the temperate world.

Can diascia 'wink coral pink' 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 diascia 'wink coral pink' 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.