Plant care
Green Arrow Arumtemperature & humidity
Peltandra virginica
More about green arrow arum
Ideal temperature for green arrow arum
Temperature kills fewer green arrow arum 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 5–28°C (41–82°F) is fine; the spot you put the plant in matters more. Below roughly 5°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Green Arrow Arum is comparatively hardy (USDA 4-9, RHS H6). 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 green arrow arum
Green Arrow Arum sits happiest at around 60–100% relative humidity. As a pond-margin plant it is naturally adapted to high atmospheric humidity; ambient outdoor humidity at a pond edge is sufficient — no supplemental misting needed. 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.
Green Arrow Arum temperature & humidity — frequently asked questions
What temperature is best for green arrow arum?
Green Arrow Arum grows best between 5–28°C (41–82°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 green arrow arum tolerate?
Green Arrow Arum starts to suffer below roughly 5°C. It tolerates a cold dormant period within USDA 4-9, but a wet cold root zone is more dangerous than cold air.
What humidity does green arrow arum need?
Green Arrow Arum prefers about 60–100% relative humidity. As a pond-margin plant it is naturally adapted to high atmospheric humidity; ambient outdoor humidity at a pond edge is sufficient — no supplemental misting needed.
How do I raise humidity for green arrow arum?
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 green arrow arum live outside?
Green Arrow Arum is rated for USDA zone 4-9 and RHS hardiness H6. 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 green arrow arum care
In the UK? Keeping green arrow arum warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full green arrow arum care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.