The Loire Valley, a Unesco World Heritage site in central France, offers so much history, food and wine to enjoy that the choice can be quite overwhelming. However, if you focus on visiting gardens, over the course of a long weekend you should naturally come across some of the other great highlights of the region – long lunches, wine-tasting opportunities and historic family chateaux. Based on visits I made last September and this April, these are my favourite gardens, old and new.