This week, David Maxwell heads to County Antrim where he meets a Canadian couple gardening in the shadow of Slemish. Judith and Hugh Jackson moved to the area from Vancouver after they both retired. They built a house in a rural area and they quickly realised that gardening at 300 metres above sea level meant they needed plants that can look after themselves. Judith reveals her friendly ‘thugs’ including the tough perennial Persicaria which cuts down on any weeding.