Cold hardiness & minimum temperature

Is Cushion Baby's Breath (Gypsophila aretioides)cold hardy? Hardiness zone & min temp

Also called Cushion Baby's Breath, Aretia Baby's Breath.

More about cushion baby's breath

About Cushion Baby's Breath

Gypsophila aretioides · also called Cushion Baby's Breath, Aretia Baby's Breath · flowering

Cushion Baby's Breath is a remarkable cushion-forming alpine perennial from rocky limestone mountains of Iran and the Caucasus. It produces an extremely tight, hard, moss-like dome of tiny greyish-green leaves, studded with small white flowers in late spring. One of the most striking and demanding alpine cushion plants, suited to specialist alpine houses or sharply drained troughs.

Cold limit: USDA 4-7 · RHS H7 (-25°C to 20°C)

Watch for — Winter wet loss: Even a brief period of waterlogging in winter can cause total plant collapse. In all but the driest, most continental climates, alpine house protection from autumn through spring is strongly recommended.

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

Yes — cushion baby's breath is genuinely cold hardy. Rated RHS H7 and USDA 4-7, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 4-7 — 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

Minimum survivable temperature is roughly below about −20 °C. Cushion Baby's Breath is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for cushion baby's breath as it gets too cold:

It tolerates winter lows to about −20 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can cushion baby's breath go outside or overwinter — and where?

Plant it out within USDA 4-7 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

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 cushion baby's breath can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Cushion Baby's Breath hardiness — frequently asked questions

Is cushion baby's breath cold hardy?

Yes — cushion baby's breath is genuinely cold hardy. Rated RHS H7 and USDA 4-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Cushion Baby's Breath is hardy across USDA 4-7; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature cushion baby's breath can survive?

Minimum survivable temperature is roughly below about −20 °C. Cushion Baby's Breath is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is cushion baby's breath?

Cushion Baby's Breath is rated USDA 4-7 and RHS H7 — Hardy in the severest European continental winters.

Can cushion baby's breath survive winter outside?

Plant it out within USDA 4-7 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to cushion baby's breath below its minimum temperature?

It tolerates winter lows to about −20 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.