Plant care
Scilla sibericatemperature & humidity
Scilla siberica
More about scilla siberica
Ideal temperature for scilla siberica
Scilla siberica is comfortable in any room a person is comfortable in, roughly -30 to 21°C (-22 to 70°F). The mistakes are micro-climates: a north-facing window on a frosty night, a south-facing windowsill in a summer heatwave, the standing draught between an opened kitchen door and the radiator behind it. Read the room around the plant, not the thermostat. Below roughly -30°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Scilla siberica is comparatively hardy (USDA 2-8 (extremely cold-hardy; needs winter chill to flower), RHS H7). 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 scilla siberica
Scilla siberica sits happiest at around Ambient outdoor humidity relative humidity. An extremely hardy outdoor bulb with no humidity requirements; it succeeds across a very wide range of conditions and climates, from open borders to woodland. 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.
Scilla siberica temperature & humidity — frequently asked questions
What temperature is best for scilla siberica?
Scilla siberica grows best between -30 to 21°C (-22 to 70°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 scilla siberica tolerate?
Scilla siberica starts to suffer below roughly -30°C. It tolerates a cold dormant period within USDA 2-8 (extremely cold-hardy; needs winter chill to flower), but a wet cold root zone is more dangerous than cold air.
What humidity does scilla siberica need?
Scilla siberica prefers about Ambient outdoor humidity relative humidity. An extremely hardy outdoor bulb with no humidity requirements; it succeeds across a very wide range of conditions and climates, from open borders to woodland.
How do I raise humidity for scilla siberica?
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 scilla siberica live outside?
Scilla siberica is rated for USDA zone 2-8 (extremely cold-hardy; needs winter chill to flower) and RHS hardiness H7. 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 scilla siberica care
In the UK? Keeping scilla siberica warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full scilla siberica care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.