Plant care
Canna 'Phasion'temperature & humidity
Canna 'Phasion'
More about canna 'phasion'
Ideal temperature for canna 'phasion'
Aim for 18-32°C (64-90°F) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly 18°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Canna 'Phasion' is comparatively hardy (USDA 7-11 (lift rhizomes in zones 6 and below; heavy mulch may protect in zone 7), RHS H3). 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 canna 'phasion'
Canna 'Phasion' sits happiest at around 50-70% relative humidity. Benefits from higher humidity to maintain leaf condition and reduce tip browning. Mulch the soil surface and group container plants together to raise local humidity. 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.
Canna 'Phasion' temperature & humidity — frequently asked questions
What temperature is best for canna 'phasion'?
Canna 'Phasion' grows best between 18-32°C (64-90°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 canna 'phasion' tolerate?
Canna 'Phasion' starts to suffer below roughly 18°C. It tolerates a cold dormant period within USDA 7-11 (lift rhizomes in zones 6 and below; heavy mulch may protect in zone 7), but a wet cold root zone is more dangerous than cold air.
What humidity does canna 'phasion' need?
Canna 'Phasion' prefers about 50-70% relative humidity. Benefits from higher humidity to maintain leaf condition and reduce tip browning. Mulch the soil surface and group container plants together to raise local humidity.
How do I raise humidity for canna 'phasion'?
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 canna 'phasion' live outside?
Canna 'Phasion' is rated for USDA zone 7-11 (lift rhizomes in zones 6 and below; heavy mulch may protect in zone 7) and RHS hardiness H3. 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 canna 'phasion' care
In the UK? Keeping canna 'phasion' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full canna 'phasion' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.