Marvel at the remarkable variety of rhododendron blooms at the RHS National Rhododendron Show* at RHS Rosemoor on Saturday 26 and Sunday 27 April. This show has more than 60 classes covering all types of rhododendrons, trade and advice stands plus magnificent displays of magnolias and camellias. Exhibitors come from all over the south and west, including the Royal Parks Department, Exbury Gardens and several southwest National Trust properties, plus Caerhays Castle Gardens, Cornwall, famous for its stunning magnolias. (Note the event opens at 11.30am on Saturday after judging.)