Cannabis grown by the state

Dozens of Dutch mayors voted for the scheme at a "weed summit" to discuss how to enforce their relaxed drug laws.

Cannabis can be legally sold at licensed shops and people can carry up to five grams without prosecution. But cultivation and dealing is outlawed, which has created an illicit two billion Euro (£1.7bn) annual trade. The plantations would supply cannabis legally.

Amsterdam is to close one in five of coffee shops because they are within 250 metres of schools.