Plant care
Lobbi Japanese Cedartemperature & humidity
Cryptomeria japonica 'Lobbii'
More about lobbi japanese cedar
Ideal temperature for lobbi japanese cedar
Aim for -15 to 25°C (5 to 77°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 -15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Lobbi Japanese Cedar is comparatively hardy (USDA 6-9, RHS H5). 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 lobbi japanese cedar
Lobbi Japanese Cedar sits happiest at around Moderate to high, 55–85% RH relative humidity. Native to humid Japanese mountain forests with high annual rainfall. Performs best in moist, maritime climates. Foliage may bronze or scorch in dry, continental winters with cold desiccating winds. Site in a sheltered position in colder regions. 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.
Lobbi Japanese Cedar temperature & humidity — frequently asked questions
What temperature is best for lobbi japanese cedar?
Lobbi Japanese Cedar grows best between -15 to 25°C (5 to 77°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 lobbi japanese cedar tolerate?
Lobbi Japanese Cedar starts to suffer below roughly -15°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 lobbi japanese cedar need?
Lobbi Japanese Cedar prefers about Moderate to high, 55–85% RH relative humidity. Native to humid Japanese mountain forests with high annual rainfall. Performs best in moist, maritime climates. Foliage may bronze or scorch in dry, continental winters with cold desiccating winds. Site in a sheltered position in colder regions.
How do I raise humidity for lobbi japanese cedar?
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 lobbi japanese cedar live outside?
Lobbi Japanese Cedar is rated for USDA zone 6-9 and RHS hardiness H5. 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 lobbi japanese cedar care
In the UK? Keeping lobbi japanese cedar warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full lobbi japanese cedar care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.