Plant care
Annual baby's breathtemperature & humidity
Gypsophila elegans
More about annual baby's breath
Ideal temperature for annual baby's breath
Temperature kills fewer annual baby's breath plants than you'd think. What kills them is the micro-climate within a normal-temperature room — a leaf pressed against single-glazed winter glass, the hot dry updraft directly above a radiator, the cold blast from an AC vent. The thermostat reading at 10–22°C (cool-season annual; declines as summer heat intensifies) (50–72°F) is fine; the spot you put the plant in matters more. Below roughly 10°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Annual baby's breath is comparatively hardy (USDA 3–9 (grown as a cool-season annual), RHS H4 (established plants survive light frost; not reliably hardy below -5°C)). Within that range it tolerates a cold dormant spell outdoors; outside it, grow it in a container you can move under cover or overwinter in a cool but frost-free spot. Hardiness assumes an established plant in well-drained soil — a wet, cold root zone kills far more plants than cold air alone.
Humidity for annual baby's breath
Annual baby's breath sits happiest at around 25–55% relative humidity. Prefers low to moderate ambient humidity. The airy, multi-stemmed habit is prone to internal humidity build-up; ensure plants are well-spaced to allow air movement through the canopy. Excessive humidity encourages stem rot at the base. The usual low-humidity tell is crisp brown leaf tips and edges while the soil moisture is fine — a sign the air, not the watering, is the problem. If you need to raise it, the reliable methods are grouping plants together, standing the pot on a tray of damp pebbles (the pot above the waterline, never in it), or running a small humidifier in winter when indoor heating dries the air most. Misting is the least effective — it raises humidity for minutes, not hours.
Annual baby's breath temperature & humidity — frequently asked questions
What temperature is best for annual baby's breath?
Annual baby's breath grows best between 10–22°C (cool-season annual; declines as summer heat intensifies) (50–72°F). Keep it out of cold draughts, off freezing windowsills in winter, and away from the hot dry air directly above radiators — the extremes matter far more than the average room temperature.
How cold can annual baby's breath tolerate?
Annual baby's breath starts to suffer below roughly 10°C. It tolerates a cold dormant period within USDA 3–9 (grown as a cool-season annual), but a wet cold root zone is more dangerous than cold air.
What humidity does annual baby's breath need?
Annual baby's breath prefers about 25–55% relative humidity. Prefers low to moderate ambient humidity. The airy, multi-stemmed habit is prone to internal humidity build-up; ensure plants are well-spaced to allow air movement through the canopy. Excessive humidity encourages stem rot at the base.
How do I raise humidity for annual baby's breath?
Group it with other plants, stand the pot on a tray of damp pebbles (kept above the waterline), or run a small humidifier in winter. Misting only helps for a few minutes, so it is the weakest option for a plant that genuinely needs more humidity.
Can annual baby's breath live outside?
Annual baby's breath is rated for USDA zone 3–9 (grown as a cool-season annual) and RHS hardiness H4 (established plants survive light frost; not reliably hardy below -5°C). Within that range it can stay outdoors; outside it, grow it in a moveable container and protect the roots from a wet, cold winter.
More annual baby's breath care
In the UK? Keeping annual baby's breath warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full annual baby's breath care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.