The Keukenhof may be the most populated Tulp community in the world, but it is not the biggest temporary residence of unbloomed Tulps. What began in two pubs in Aalsmeer, 1910 have grown into the largest flower auction and the largest covered commercial building in the world. 80% of all the daughters of the Tulps move from the Netherlands to the rest of the world.
Image source: http://www.flowerexperts.com/auction_clock.asp