Walnut
Juglans regia
Also called Common walnut and English walnut
Garden plant · Herbs, veg & fruitNOTHING GROWS UNDER IT. The roots and fallen leaves put juglone into the soil and it kills tomatoes, apples and rhododendrons outright. Site it once, at the edge of everything.
Care at a glance
- Ease
- Medium
- Water
- Every 8 daysWater the ground — water at the base, in the morning, not over the leaves.
- Light
- Full sun
- Feed
- Every 45 days
- Humidity
- Average
- Hardiness
- Hardy — a very cold winter RHS H6, to -20°C
- Size
- 14 m tall · 10 m across
- Lifecycle
- Tree
- Origin
- Europe to central Asia
Is it safe for pets and people?
PetsNothing recorded against it
No animal-poison authority lists this plant either way.
PeopleNot checked yet
Nobody has checked this one against a source for us yet, so treat it as unknown rather than safe.
Checked against ASPCA and RHS on 2026-08-04. Where a source says nothing, we say nothing.
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.