I celebrated the arrival of my friend Kathryn Galbraith's new book Arbor Day Square and then I saw My Garden by Kevin Henkes on the New Book shelf at the Heath Library. As a former librarian I know it used to be difficult to find books for young children about gardening, whether real gardens with real information, or about imaginary gardens, but happily that seems to be changing. Kevin Henkes is one of my favorites authors and illustrators…