Plant care
Perforate St John's-worttemperature & humidity
Hypericum perforatum
More about perforate st john's-wort
Ideal temperature for perforate st john's-wort
Temperature kills fewer perforate st john's-wort 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 -25 to 30 °C (-13 to 86 °F) is fine; the spot you put the plant in matters more. Below roughly -25°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Perforate St John's-wort is comparatively hardy (USDA 5-9, 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 perforate st john's-wort
Perforate St John's-wort sits happiest at around Low to moderate (30–60 %) relative humidity. Tolerates open, exposed conditions; high humidity with poor drainage increases susceptibility to fungal stem and root diseases. 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.
Perforate St John's-wort temperature & humidity — frequently asked questions
What temperature is best for perforate st john's-wort?
Perforate St John's-wort grows best between -25 to 30 °C (-13 to 86 °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 perforate st john's-wort tolerate?
Perforate St John's-wort starts to suffer below roughly -25°C. It tolerates a cold dormant period within USDA 5-9, but a wet cold root zone is more dangerous than cold air.
What humidity does perforate st john's-wort need?
Perforate St John's-wort prefers about Low to moderate (30–60 %) relative humidity. Tolerates open, exposed conditions; high humidity with poor drainage increases susceptibility to fungal stem and root diseases.
How do I raise humidity for perforate st john's-wort?
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 perforate st john's-wort live outside?
Perforate St John's-wort is rated for USDA zone 5-9 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 perforate st john's-wort care
In the UK? Keeping perforate st john's-wort warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full perforate st john's-wort care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.