Gardeners' World continues with more timely spring tasks to keep our gardens looking their best. Monty Don is pruning his buddleja and sowing seeds for a stunning summer display. Carol Klein meets a young family in Gloucestershire who are just getting started with their first garden. Over the course of the year, Carol will be helping and advising them on how to transform their small space into a lovely multifunctional family garden. Joe Swift visits a gardener in Northumberland who copes with temperatures of -18C in the winter and 30C in the summer. Despite these extremes, she has succeeded in developing a wonderful garden she can enjoy all year round. And we meet a grower whose love of butterflies and bees has inspired his fabulous and extensive collection of buddleja.