As the Autumn Equinox arrives, along with celebrating the season's apple bounty Monty Don plans for Christmas by planting bulbs to brighten the dark winter days ahead. He also offers advice on planting garlic for next year. Carol Klein celebrates the sedum, one of the autumn season's highlights, while Adam Frost provides an update on the development of his Lincolnshire garden. The programme also visits a garden in Gloucestershire, which is a haven for moths and butterflies, while Alan Power handles the summer work at Stourhead.