Plant care
Radicchio 'Rossa di Treviso'temperature & humidity
Cichorium intybus var. foliosum 'Rossa di Treviso'
More about radicchio 'rossa di treviso'
Ideal temperature for radicchio 'rossa di treviso'
Temperature kills fewer radicchio 'rossa di treviso' 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 10 to 20°C (50 to 68°F) is fine; the spot you put the plant in matters more. Below roughly 10°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Radicchio 'Rossa di Treviso' is comparatively hardy (USDA Grown as a cool-season annual/biennial; tolerates light frost, RHS H4). 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 radicchio 'rossa di treviso'
Radicchio 'Rossa di Treviso' sits happiest at around Ambient outdoor relative humidity. An outdoor leaf crop with no special humidity needs. Good airflow between plants is important in damp autumn weather to prevent grey mould and rot in the tightly packed leaves. 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.
Radicchio 'Rossa di Treviso' temperature & humidity — frequently asked questions
What temperature is best for radicchio 'rossa di treviso'?
Radicchio 'Rossa di Treviso' grows best between 10 to 20°C (50 to 68°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 radicchio 'rossa di treviso' tolerate?
Radicchio 'Rossa di Treviso' starts to suffer below roughly 10°C. It tolerates a cold dormant period within USDA Grown as a cool-season annual/biennial; tolerates light frost, but a wet cold root zone is more dangerous than cold air.
What humidity does radicchio 'rossa di treviso' need?
Radicchio 'Rossa di Treviso' prefers about Ambient outdoor relative humidity. An outdoor leaf crop with no special humidity needs. Good airflow between plants is important in damp autumn weather to prevent grey mould and rot in the tightly packed leaves.
How do I raise humidity for radicchio 'rossa di treviso'?
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 radicchio 'rossa di treviso' live outside?
Radicchio 'Rossa di Treviso' is rated for USDA zone Grown as a cool-season annual/biennial; tolerates light frost and RHS hardiness H4. 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 radicchio 'rossa di treviso' care
In the UK? Keeping radicchio 'rossa di treviso' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full radicchio 'rossa di treviso' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.