First: Floralia Brussels cannot be found in Brussels. They are found in the province of Flemish Brabant, in Groot-Bijgaarden. I admit, it’s really close to Brussels, but no… it isn’t Brussels!
Second: Floralia Brussels is a flower exhibition that takes place every year on the grounds of the Castle of Groot-Bijgaarden.

The castle was built in the 12the century for Almaric Bigard, the first lord of Bigard. The international flower exhibition takes place in spring and shows mostly tulips from the Netherlands. The spring flowers offers an unforgettable flower experience. The castle’s garden is about 14 ha big and it incorporates nearly all spring bulb varieties. Each exhibition the gardeners of the castle plant over one million bulbs by hand. Most of the bulbs are tulips, with almost 400 varieties. Other flowers are hyacinths and daffodils, a labyrinth, an indoor show, a panorama of the park on the roof terrace of the Donjon, …

There are sometimes activities during the exhibition (cf. this year there was a Parade of the Venetian Costumes).