According to Official Guinness Records,
The world's largest flower auction and flower market is Bloemenveiling Aalsmeer (VBA) in Aalsmeer, The Netherlands. Every weekday approximately 19 million flowers and 2 million plants of over 12,000 varieties are sold with a daily turnover of €6 million ($7.2 million, £4 million). The total area of the building covers 999,000 m² (10 million ft²) which is equal to 165 soccer fields. The VBA has a network of 7,000 growers who provide the plants/flowers and almost 1,400 buyers who export them. Approximately 85% of the goods are exported that day to European countries and 10% go to USA. Imports generally come from Africa, Europe and Scandinavia. The auctioning takes place using 13 clocks in five auction rooms handling 55,000 transactions per day. A system known as 'Dutch clock auction' is used, whereby the auctioneer sets the starting price high and prices then go down until a buyer pushes a button to freeze the price. The risk being wait too long and another buyer will get the goods, but press too soon and the buyer might pay too much. The VBA was established in 1968, following a merger of two Aalsmeer auctions: Veiling Bloemenlust and Centrale Aalsmeerse. These auctions themselves began in Aalsmeer in 1911/1912 where growers would gather in a cafe and sell their produce.
For a complete list of 2004 records, please visit 2004 Guinness Records in Netherlands.