Plant care
Japanese Cedar 'Globosa Nana'temperature & humidity
Cryptomeria japonica 'Globosa Nana'
More about japanese cedar 'globosa nana'
Ideal temperature for japanese cedar 'globosa nana'
Temperature kills fewer japanese cedar 'globosa nana' 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 -15 to 28°C (5 to 82°F) is fine; the spot you put the plant in matters more. Below roughly -15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Japanese Cedar 'Globosa Nana' is comparatively hardy (USDA 6-9 (outdoor dwarf shrub), 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 japanese cedar 'globosa nana'
Japanese Cedar 'Globosa Nana' sits happiest at around 40-70% relative humidity. Likes moist, sheltered air and cool maritime conditions. Hot, dry, windy sites cause foliage scorch and winter browning. 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.
Japanese Cedar 'Globosa Nana' temperature & humidity — frequently asked questions
What temperature is best for japanese cedar 'globosa nana'?
Japanese Cedar 'Globosa Nana' grows best between -15 to 28°C (5 to 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 japanese cedar 'globosa nana' tolerate?
Japanese Cedar 'Globosa Nana' starts to suffer below roughly -15°C. It tolerates a cold dormant period within USDA 6-9 (outdoor dwarf shrub), but a wet cold root zone is more dangerous than cold air.
What humidity does japanese cedar 'globosa nana' need?
Japanese Cedar 'Globosa Nana' prefers about 40-70% relative humidity. Likes moist, sheltered air and cool maritime conditions. Hot, dry, windy sites cause foliage scorch and winter browning.
How do I raise humidity for japanese cedar 'globosa nana'?
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 japanese cedar 'globosa nana' live outside?
Japanese Cedar 'Globosa Nana' is rated for USDA zone 6-9 (outdoor dwarf shrub) 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 japanese cedar 'globosa nana' care
In the UK? Keeping japanese cedar 'globosa nana' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full japanese cedar 'globosa nana' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.