In this week's Gardeners' World, Monty Don shows how to get the best from tomatoes planted in grow bags, demonstrates how to divide agapanthus, and we catch up on developments in the recently revamped dry garden.Adam Frost shares the progress at his new plot and tackles planting in a shady border against a north-facing wall. Frances Tophill meets a couple in Worcestershire who've created a garden inspired by their travels around the world.We visit an allotmenteer in Lancashire who has a productive and bountiful harvest of vegetables all year round. In Cornwall, we meet a window cleaner on a mission to champion trees, and more Gardeners' World viewers share the joy that gardening brings them.