His Norwich garden and nursery began in the 1980s and Giles featured on TV several times including on Garden Calendar, Gardens Without Borders, Real Gardens, Grass Roots, Inside Out, Gardeners' Gardens, Small Town Gardens, and many more.
His latest book ‘The Encyclopaedia of Exotic Plants For Temperate Climates’ published by Timber Press, covers 2,500 species and cultivars that can be grown in the UK, the Pacific North-western coastal States of North America and any part of the world that has a temperate climate
A company statement said: "He was determined to relish every last moment of life and enjoyed relatively good health until earlier this year when, after a spell in hospital, he discovered that the treatments were no longer effective. Will enjoyed working in his garden for as long as his health allowed, creating the new green wall and directing the planting scheme for this season. He will be sadly missed by all who have known him personally, or been inspired by his creativity."
The garden will be closed for the rest of 2015.