Biggest numbers by far, with some having to watch on the monitors outside the Gardening Matters forum tent, were for Sarah Eberle’s talk. Sarah http://www.saraheberle.com/ is the pixie-like star of Hampton Court and Chelsea with the energy of a nuclear reactor. This year, with six week’s notice, she built three gardens on £15,000. Peanuts. Larger Chelsea gardens can cost up to half a million.