Held in the Netherlands every ten years since 1960, Floriade 2012
opens April 5 in in North Limburg (once the Duchy of Limburg). Set in an expansive park in Venlo with the many pavilions separated by gardens and woods, the world horticultural expo runs through October 7. The flower fields at Keukenhof
, located outside Lisse between Amsterdam and the Hague, are open starting March 22. A hunting area in the 15th century, the imposing castle and gardens at Kekenhoff have been host to an open flower exhibition since 1949. Seven million flower bulbs are planted annually in the park, usually at its peak in mid-April.