Almost every part is deadly — leaves, bark, and seeds. The red berries look tempting but the seed inside is severely toxic. One of the most poisonous trees in Britain. Do not handle cut branches.

All parts are toxic, especially the seed pods which resemble peas. Can cause severe vomiting, convulsions, and loss of consciousness. Keep children well away.

Raw berries contain parasorbic acid which causes stomach upset. Safe when cooked, but never eat raw berries in the field.

Raw berries, leaves, bark and roots contain cyanogenic glycosides. Berries can be used in cooking once ripe, but raw consumption causes nausea and vomiting.

The bright red berries are toxic to humans and pets. As few as 20 berries can be fatal to a child. Sharp leaf spines can also cause skin punctures.

Conkers are poisonous — they contain aesculin and should never be eaten despite resembling edible chestnuts. The husk spines can also cause skin irritation.

Acorns and leaves contain tannins which are toxic in quantity. Can cause kidney damage if eaten. Safe to handle — just don’t eat them.

Sap can cause contact dermatitis in sensitive individuals. Sycamore seeds have also been linked to atypical myopathy in horses — keep dogs from eating seeds.

Generally safe to handle. Some people experience mild skin irritation from prolonged contact with bark or sap.

The green husks of walnut contain juglone, which stains skin dark brown and can cause skin irritation. Wear gloves if handling fallen nuts in their husks.