Monty goes into the potting shed at Longmeadow carrying purple sweet peas which are a similar colour to the penstemons. One of the special things about penstemons at this time of year is they give you a huge range of colour. He shows how to take cuttings by looking for new material but leaving enough foliage to plant them out. Monty puts the cuttings in the greenhouse which will take a few weeks to root. We visited a couple of allotmenteers, George Dunnion and Serge Charles at the Golf Course Allotments in Muswell Hill, London who have turned their plot into a paradise. Fruit and veg aside, it's become the home to their absolute obsession for roses. Hedges are a really important part of Monty's garden. When he first arrived at Longmeadow, there was just a couple of small scrubby trees and that was it, so the decision to plant hedges was to create protection and to divide the garden up into spaces. He has framed views and created drama around the garden by contrasting low hedges with some very tall ones. Carol Klein visits an 18th century walled garden, Cally Gardens in Dumfries and Galloway. It belongs to Michael Wickenden, a twenty-first century plant hunter who has turned it into a very special home for his enormous collection of rare and unusual plants gathered from across the globe.