Even today, most garden writing in Britain is still haunted by the ghosts of Percy Thrower and Arthur Hellyer. It is nuts and bolts stuff – professionals telling amateurs what to plant or build and why and how and when. The American garden writer Henry Mitchell, however, was something else. Above all, he was as much a writer as a gardener: and a good one. Know a man by his friends – and Mitchell’s included the novelist Eudora Welty and the New Yorker essayist E. B. White (who also wrote the children’s classics Charlotte’s Web and Stuart Little).