Henry Doubleday Research Association. Garden Organic, the UK's leading organic growing charity, has been at the forefront of the organic horticulture movement for 50 years and is dedicated to researching and promoting organic gardening, farming and food. With gardens open to the public at Ryton in Coventry, Yalding near Maidstone, and Audley End in Saffron Walden. Website and gardens are well worth a visit.