Marian Boswall is a UK Landscape Architect and Horticulturist who believes that sustainable gardening ideas add to the beauty of gardens. In this episode we discuss her ethos and how it came through in her book, 'Sustainable Gardening' via projects and ideas that every gardener can carry out. The Plant of the Week is the Blue Mist flower, or Conoclinium coelestinum, and I talk about how to divide perennials.