Bunny Williams' insight as an interior designer has proven invaluable in creating "outdoor rooms" that constitute her gardens. Bunny shares her insights in her book on the subject, On Garden Style (Simon & Schuster, 1998). The book is a practical and inspirational garden-design style book for novice and experienced gardeners.

On Garden Style won the Quill and Trowel Award (overall excellence for a garden book) given by the Garden Writers Association of America in April, 1999.