Monty Don gives advice on how to deal with overcrowded clumps of summer flowering bulbs and plants yew to make a start on creating a topiary Nellie. Frances Tophill travels to Somerset to the garden of a woman who grows a huge collection of unusual vegetables used in Thai cooking, while Carol Klein is in Devon celebrating one of the brightest additions to the late summer border - the rudbekia. Plus, Mark Lane gives design tips on the main elements of a formal garden and Adam Frost puts the finishing touches to the new build garden in Leicester he started earlier in the year.