Cold hardiness & minimum temperature

Is Dragon Wing Begonia (Begonia x hybrida 'Dragon Wing Red')cold hardy? Hardiness zone & min temp

Also called Dragon Wing Red Begonia.

More about dragon wing begonia

About Dragon Wing Begonia

Begonia x hybrida 'Dragon Wing Red' · also called Dragon Wing Red Begonia · flowering

Dragon Wing is a tough hybrid cane-type begonia with glossy, deep-green wing-shaped leaves and cascading clusters of bright red (or pink) flowers all season. Bred for heat and humidity tolerance, it shrugs off conditions that stall other begonias, blooming non-stop in containers, hanging baskets, and shaded beds, then overwinters happily as a large indoor plant.

Cold limit: USDA 10-11 (grown as an annual or houseplant in colder zones) · RHS H1b (16-29°C)

Watch for — Cold damage: Leaves blacken and collapse below about 10°C; bring plants indoors before first frost to overwinter.

What dragon wing begonia's hardiness rating actually means

Hardiness works differently for dragon wing begonia: 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 H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 10-11 (grown as an annual or houseplant in colder zones) — 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 dragon wing begonia 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 dragon wing begonia 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 dragon wing begonia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Frost protection for borderline dragon wing begonia

Dragon Wing Begonia 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.

Dragon Wing Begonia hardiness — frequently asked questions

Is dragon wing begonia cold hardy?

Hardiness works differently for dragon wing begonia: 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. Dragon Wing Begonia is grown 10-11 (grown as an annual or houseplant in colder zones); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature dragon wing begonia 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 dragon wing begonia?

Dragon Wing Begonia is rated USDA 10-11 (grown as an annual or houseplant in colder zones) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can dragon wing begonia 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 dragon wing begonia 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.