Frances Tophill makes a final visit to her shared allotment and joins in with the festivities at an annual show. Adam Frost visits the RHS garden at Wisley, Surrey, where he meets its curator to find out which plants have fared well and which have suffered during the hot, dry summer. Plus, Nick Bailey investigates knotweed, Arit Anderson provides inspiration for colourful late-season containers and a visit to Northamptonshire to meet a gardener who extracts natural dyes from the plants she grows in her garden.