A lot has happened in the world of gardening since "Theme Gardens" was first published in 1982. The parallels to cooking are striking-we now have a new and much expanded repertoire of flowers, herbs, and vegetables; we look for more variety in the way we garden and landscape; and it's become a more important part of many more people's lives. And a lot has happened to Barbara Damrosch. Through "Theme Gardens" and her classic, "The Garden Primer," through...