Celeriac
Apium graveolens var. rapaceum
Also called Celery root and Knob celery
Garden plant · Herbs, veg & fruitIT MUST NEVER DRY OUT, not once, from May to October — a single check makes it woody and hollow. It is the thirstiest thing in the vegetable garden.
Care at a glance
- Ease
- Hard
- Water
- Every 2 daysWater the ground — water at the base, in the morning, not over the leaves.
- Light
- Full sun
- Feed
- Every 21 days
- Humidity
- Average to high
- Hardiness
- Hardy — an average winter RHS H4, to -10°C
- Size
- 0.5 m tall · 0.4 m across
- Lifecycle
- Annual
- Origin
- The Mediterranean
Is it safe for pets and people?
PetsNothing recorded against it
No animal-poison authority lists this plant either way.
PeopleIrritates skin
The leaves, in sunlight.
HandlingTake care handling it
RHS category C — harmful to skin in sunlight. Cover your arms to handle the foliage on a bright day.
Checked against ASPCA and RHS on 2026-08-04.
A guide, not veterinary or medical advice. If a pet or a person has eaten a plant and you are worried, call your vet or doctor now — don’t wait for signs to appear. Spotted a mistake? Tell us.