Plant care
Six Hills Giant Catminttemperature & humidity
Nepeta x faassenii 'Six Hills Giant'
More about six hills giant catmint
Ideal temperature for six hills giant catmint
Six Hills Giant Catmint is comfortable in any room a person is comfortable in, roughly 15-27°C (59-81°F). The mistakes are micro-climates: a north-facing window on a frosty night, a south-facing windowsill in a summer heatwave, the standing draught between an opened kitchen door and the radiator behind it. Read the room around the plant, not the thermostat. Below roughly 15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Six Hills Giant Catmint is comparatively hardy (USDA 4-8 (fully hardy perennial outdoors), 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 six hills giant catmint
Six Hills Giant Catmint sits happiest at around 30-50% relative humidity. Likes dry air and breezy, open sites. Outdoor humidity is fine; its size means crowding raises mildew risk, so give it generous space for airflow. 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.
Six Hills Giant Catmint temperature & humidity — frequently asked questions
What temperature is best for six hills giant catmint?
Six Hills Giant Catmint grows best between 15-27°C (59-81°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 six hills giant catmint tolerate?
Six Hills Giant Catmint starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 4-8 (fully hardy perennial outdoors), but a wet cold root zone is more dangerous than cold air.
What humidity does six hills giant catmint need?
Six Hills Giant Catmint prefers about 30-50% relative humidity. Likes dry air and breezy, open sites. Outdoor humidity is fine; its size means crowding raises mildew risk, so give it generous space for airflow.
How do I raise humidity for six hills giant catmint?
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 six hills giant catmint live outside?
Six Hills Giant Catmint is rated for USDA zone 4-8 (fully hardy perennial outdoors) 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 six hills giant catmint care
In the UK? Keeping six hills giant catmint warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full six hills giant catmint care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.