A preview of the week's events at the 83rd annual festival of flowers at the Royal Hospital showground in London. The green-fingered posse of Alan Titchmarsh , Diarmuid Gavin , Rachel de Thame and Joe Swift consider the contenders for this year's medals and launch the viewers' poetry competition. Plus Wesley Kerr reports on a unique discovery in Australia. There are more visits to the show weekdays
12.30pm, and at 8pm on BBC2. www.bbc.co.uk/helsea BBCi: a range of interactive options are available to digital viewers Chelsea's hardy perennials: page 38 Lavender shrubs offer: page