2. Chelsea Flower Show

The Buzz -- This internationally renowned garden show is held along the Thames on the grounds of the Royal Hospital. It's a much-anticipated event, famous for its incredibly inventive displays of gardening and landscaping. Show gardens created by top designers are a major draw, along with plots intended to provoke ideas in novices and professionals alike. Visitors also get the scoop on new plants, garden furniture, greenhouses and practically anything related to horticulture. Tickets must be purchased in advance – there are none available at the door. Admission on the first two days of the show is restricted to members of the Royal Horticultural Society. TUBE: Sloane Square