Nine programmes on the science behind gardening presented by Alan Hibbert 7: Who Needs Soil?
You can grow a plant perfectly well in water with no soil at all, providing you add the right nutrients especially the ' big three ' - nitrogen, phosphorus and potassium.
Film editor JOHN KEENAN
Produced by RON BLOOMFIELD , BRYN BROOKS Book (same title), 19.50, from bookshops