Cold hardiness & minimum temperature

Is Annual baby's breath (Gypsophila elegans)cold hardy? Hardiness zone & min temp

Also called Annual baby's breath, Showy baby's breath, Annual gypsophila.

More about annual baby's breath

About Annual baby's breath

Gypsophila elegans · also called Annual baby's breath, Showy baby's breath · flowering

Annual baby's breath produces a delicate, airy cloud of small white or pink flowers on branching stems, blooming profusely for 4–6 weeks. It is a classic filler in cut-flower bouquets and cottage gardens. Direct-sow in full sun in alkaline, well-drained soil. Succession-sow every 3–4 weeks for continuous bloom from late spring to early autumn.

Cold limit: USDA 3–9 (grown as a cool-season annual) · RHS H4 (established plants survive light frost; not reliably hardy below -5°C) (10–22°C (cool-season annual; declines as summer heat intensifies))

What annual baby's breath's hardiness rating actually means

Hardiness works differently for annual baby's breath: 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 3–9 (grown as a cool-season annual) — 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 annual baby's breath 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 annual baby's breath 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 annual baby's breath 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 annual baby's breath

Annual baby's breath 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.

Annual baby's breath hardiness — frequently asked questions

Is annual baby's breath cold hardy?

Hardiness works differently for annual baby's breath: 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. Annual baby's breath is grown 3–9 (grown as a cool-season annual); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature annual baby's breath 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 annual baby's breath?

Annual baby's breath is rated USDA 3–9 (grown as a cool-season annual) and RHS H4 — Hardy in an average winter across much of the temperate world.

Can annual baby's breath 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 annual baby's breath 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.