Aalsmeer Flower Auction (Bloemenveiling Aalsmeer) 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 largest building by footprint in the world, covering 518,000m² (10.6 million sq ft; 243 acres). Flowers from all over the world – Europe, Ecuador, Colombia, Ethiopia, Kenya and other countries – are traded every day in this gigantic building. Around 20 million flowers are sold daily. This increases by around 15 percent around special days such as Valentine's Day and Mother's Day. Their flowers are subjected to around 30 quality checks so that they can be graded on a scale (A1, A2 and B).