If you've got green fingers then you'll be all too aware that the Olympics of gardening are taking place across the water. Coverage of the 2013 Chelsea Flower Show will be plentiful on the BBC this week, so why not sit back and relax with a round up of the day's events? Alan Titchmarsh and Joe Swift reveal the gold medal-winning show gardens and talk to the designer who has been victorious in the prestigious Best in Show category. Meanwhile Carol Klein finds out what it takes to be named the best of the best in the Great Pavilion