Chelsea - the world’s greatest flower show The show is held annually for five days in May It has been held at the Royal Hospital, Chelsea since 1913 This will be the 85th show to be held at this site Originally known as the Great Spring Show, it was first held in Kensington in 1862 The exhibitors There are around 600 exhibitors in total. The show will feature around 50 gardens and more than 100 floral exhibitors in the Great Pavilion.