Plant care
Parsnip 'Hollow Crown'temperature & humidity
Pastinaca sativa 'Hollow Crown'
More about parsnip 'hollow crown'
Ideal temperature for parsnip 'hollow crown'
Parsnip 'Hollow Crown' is comfortable in any room a person is comfortable in, roughly 7-18°C (45-65°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 7°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Parsnip 'Hollow Crown' is comparatively hardy (USDA 2-9 (grown as an annual; roots overwinter in-ground in milder zones), 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 parsnip 'hollow crown'
Parsnip 'Hollow Crown' sits happiest at around Ambient outdoor relative humidity. A field crop needing no extra humidity. Allow airflow between rows; as an heirloom it is more canker-prone, so dry foliage and good spacing matter. 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.
Parsnip 'Hollow Crown' temperature & humidity — frequently asked questions
What temperature is best for parsnip 'hollow crown'?
Parsnip 'Hollow Crown' grows best between 7-18°C (45-65°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 parsnip 'hollow crown' tolerate?
Parsnip 'Hollow Crown' starts to suffer below roughly 7°C. It tolerates a cold dormant period within USDA 2-9 (grown as an annual; roots overwinter in-ground in milder zones), but a wet cold root zone is more dangerous than cold air.
What humidity does parsnip 'hollow crown' need?
Parsnip 'Hollow Crown' prefers about Ambient outdoor relative humidity. A field crop needing no extra humidity. Allow airflow between rows; as an heirloom it is more canker-prone, so dry foliage and good spacing matter.
How do I raise humidity for parsnip 'hollow crown'?
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 parsnip 'hollow crown' live outside?
Parsnip 'Hollow Crown' is rated for USDA zone 2-9 (grown as an annual; roots overwinter in-ground in milder zones) 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 parsnip 'hollow crown' care
In the UK? Keeping parsnip 'hollow crown' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full parsnip 'hollow crown' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.