Plant care
Hosta 'June'temperature & humidity
Hosta 'June'
More about hosta 'june'
Ideal temperature for hosta 'june'
Temperature kills fewer hosta 'june' 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 15-25°C in active growth, fully cold-hardy and dormant in winter (59-77°F in active growth, fully cold-hardy and dormant in winter) 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
Hosta 'June' is comparatively hardy (USDA 3-9, 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 hosta 'june'
Hosta 'June' sits happiest at around Ambient outdoor humidity (40-70%) relative humidity. An outdoor woodland perennial that enjoys moderate to high humidity. No special measures are needed in a sheltered, shaded border. 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.
Hosta 'June' temperature & humidity — frequently asked questions
What temperature is best for hosta 'june'?
Hosta 'June' grows best between 15-25°C in active growth, fully cold-hardy and dormant in winter (59-77°F in active growth, fully cold-hardy and dormant in winter). 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 hosta 'june' tolerate?
Hosta 'June' starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 3-9, but a wet cold root zone is more dangerous than cold air.
What humidity does hosta 'june' need?
Hosta 'June' prefers about Ambient outdoor humidity (40-70%) relative humidity. An outdoor woodland perennial that enjoys moderate to high humidity. No special measures are needed in a sheltered, shaded border.
How do I raise humidity for hosta 'june'?
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 hosta 'june' live outside?
Hosta 'June' is rated for USDA zone 3-9 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 hosta 'june' care
In the UK? Keeping hosta 'june' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full hosta 'june' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.