The new Covent Garden Flower Market will be opening on 27 February. The 30 businesses will move to a smaller 4,650sq m (50,000sq ft) building as the old site nearby is redeveloped for housing.
British Flowers Week is on 19-25 June.
Covent Garden Market Association, which runs the London wholesale flower market, founded the British Flowers Week campaign in 2013.
Flowers From The Farm, the network of around 200 UK artisan cut flower growers, is backing the campaign, which aims to celebrate British cut flower growers, wholesalers and florists.