The RHS Chelsea Flower Show, officially the Great Spring Show, is a garden show held each year on five days in May by the Royal Horticultural Society ("RHS") in the grounds of the Royal Hospital Chelsea in Chelsea, London. It is the most famous such show in the United Kingdom, perhaps the most famous gardening event in the world and part of London's summer social season. Popular parts of the Chelsea Flower Show include the show gardens designed by leading names and the centrepiece of the floral marquee.