In the grounds of which building is the Chelsea Flower Show held?

The Chelsea Flower Show is held in the grounds of the Royal Hospital Chelsea. This iconic venue not only hosts the prestigious gardening event but is also a historic institution, home to the Chelsea Pensioners, who are veterans of the British Army. The show, organized by the Royal Horticultural Society, takes advantage of the Royal Hospital’s beautiful gardens to showcase a wide array of floral displays, innovative garden designs, and horticultural excellence. This unique setting adds to the event's charm and prestige, making it the perfect backdrop for one of the world’s most celebrated flower shows.

The other locations mentioned, such as Hampton Court Palace, Kensington Palace, and St. James's Palace, are all significant historical sites in London but do not host the Chelsea Flower Show, which is distinctively associated with the Royal Hospital Chelsea. This connection enhances the event's cultural and historical significance within the context of London’s rich heritage.