Plant care
Prince of Wales Junipertemperature & humidity
Juniperus horizontalis 'Prince of Wales'
More about prince of wales juniper
Ideal temperature for prince of wales juniper
Temperature kills fewer prince of wales juniper 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 -40 to 35°C (-40 to 95°F) is fine; the spot you put the plant in matters more. Below roughly -40°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Prince of Wales Juniper is comparatively hardy (USDA 3-9 (very cold-hardy prairie selection), 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 prince of wales juniper
Prince of Wales Juniper sits happiest at around 30-60% relative humidity. Outdoor shrub with no particular humidity needs. Prefers open, airy positions that keep the low foliage dry and limit fungal tip blight. 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.
Prince of Wales Juniper temperature & humidity — frequently asked questions
What temperature is best for prince of wales juniper?
Prince of Wales Juniper grows best between -40 to 35°C (-40 to 95°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 prince of wales juniper tolerate?
Prince of Wales Juniper starts to suffer below roughly -40°C. It tolerates a cold dormant period within USDA 3-9 (very cold-hardy prairie selection), but a wet cold root zone is more dangerous than cold air.
What humidity does prince of wales juniper need?
Prince of Wales Juniper prefers about 30-60% relative humidity. Outdoor shrub with no particular humidity needs. Prefers open, airy positions that keep the low foliage dry and limit fungal tip blight.
How do I raise humidity for prince of wales juniper?
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 prince of wales juniper live outside?
Prince of Wales Juniper is rated for USDA zone 3-9 (very cold-hardy prairie selection) 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 prince of wales juniper care
In the UK? Keeping prince of wales juniper warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full prince of wales juniper care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.