More Christmas books. There is no end of books to delight and inform the gardener. Kate Frey’s new book, Ground Rules: 100 Easy Lessons for Growing a More Glorious Garden (Timber Press $19.95) has a sweet cover with painted flowers and birds. It would be easy to dismiss this book as something only of interest for the new gardener. However, it does not take a long browse through each bright page to realize that there is always something…