The Chelsea Flower show is held every May at the Royal Hospital
Chelsea in Chelsea, London. It is the most famous flower show in
the United Kingdom.
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If you mean the Royal Hospital, Chelsea - which isn't a
hospital, it's almshouses for retired army personnel - the nearest
main line station is Victoria and the nearest underground station
is Sloane Square.
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Its based in the National Army Museum, Royal Hospital Road,
Chelsea, London SW3 4HT