Plant care
Red Hot Pokertemperature & humidity
Kniphofia uvaria
More about red hot poker
Ideal temperature for red hot poker
Temperature kills fewer red hot poker 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 to 40°C (14 to 104°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
Red Hot Poker is comparatively hardy (USDA 6-9, RHS H4). 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 red hot poker
Red Hot Poker sits happiest at around 30-60% relative humidity. Tolerates average garden humidity well. The main concern is soil drainage rather than atmospheric humidity. In consistently wet, cold winter conditions, protect the crown with a dry mulch of straw or bracken, or in very cold zones lift and store rhizomes. 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.
Red Hot Poker temperature & humidity — frequently asked questions
What temperature is best for red hot poker?
Red Hot Poker grows best between -10 to 40°C (14 to 104°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 red hot poker tolerate?
Red Hot Poker starts to suffer below roughly -10°C. It tolerates a cold dormant period within USDA 6-9, but a wet cold root zone is more dangerous than cold air.
What humidity does red hot poker need?
Red Hot Poker prefers about 30-60% relative humidity. Tolerates average garden humidity well. The main concern is soil drainage rather than atmospheric humidity. In consistently wet, cold winter conditions, protect the crown with a dry mulch of straw or bracken, or in very cold zones lift and store rhizomes.
How do I raise humidity for red hot poker?
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 red hot poker live outside?
Red Hot Poker is rated for USDA zone 6-9 and RHS hardiness H4. 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 red hot poker care
In the UK? Keeping red hot poker warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full red hot poker care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.