As the cow parsley and hawthorn blossom herald the real arrival of summer, the jewel garden starts to show signs of the abundance of colour that is to come. Monty Don prepares to surround the courtyard garden with scented summer pots. He also shares tips on how to care for citrus plants in containers. Joe Swift visits a rarely seen private garden created by one of Britain's foremost designers that will open for the first time as part of collaboration between the RHS and the Society of Garden Designers. This wonderful contemporary space has a free-flowing organic style inspired by the surrounding landscape. Carol Klein tackles a gardening dilemma that will be of interest to all those who have a passion for climbers. She travels to Wiltshire to help a couple who have lost most of the plants on their pergola to the harsh winter and have failed to get others established.