Aalsmeer Flower Auction is a flower auction that takes place in Aalsmeer, Netherlands. It is the largest flower auction in the world. The Aalsmeer Flower Auction building is the fourth largest building by footprint in the world, covering 518,000 square metres. The auction is set up as a Dutch auction in which the price starts high and works its way down. Bidders get only a few seconds to bid on the flowers before they are sold and passed on to the new owner.