Longmeadow is now under full sail but needs a gentle steer to keep it looking beautiful all summer long. This week, Monty Don will be cutting back his delphiniums and adding a touch of the exotic to his Jewel Garden – He plants a banana plant. He also lifts and dries shallots, plus shows us his elephant garlic already drying. He trims lavender in pots. Carol Klein is in Kent meeting lavender expert and breeder, Dr Simon Charlesworth, whose stunning walled garden Kilver Court, Shepton Mallet, Somerset, is packed with many varieties of this beautifully scented plant. And Joe Swift visits the founder of the Mulberry fashion label, whose Somerset garden is a design classic.