Article 20
1. Member States shall provide that seed of industrial chicory may not be placed on the market unless it has been officially certified as "basic seed" or "certified seed". 2. Member States shall provided that seed of other vegetable species may not be placed on the market unless it has been officially certified as "basic seed" or "certified seed", or is standard seed. 3. It may, however, under the procedure referred to in Article 46(2) be provided that after specified dates seed of certain vegetable species may not be placed on the market unless it has been officially certified as "basic seed" or "certified seed". 4. Member States shall ensure that official examinations of seeds are carried out in accordance with current international methods, in so far as such methods exist.