One of the main points about a garden is enclosure, which is essentially absent from a showground. Chelsea is always packed, with 160,000 visitors over five days, so one stands with hundreds of others at the borders of the plots, so you can't acquire a proper look, can't get the true feel. The space has to succeed or fail directly – like a fashion show, what's there needs perfect structure, exquisite planting and sophisticated use of color.