Not especially comprehensive, but with plenty of recommendations for more of the best varieties than you'll ever need. A book that tells you what plants to grow rather than giving information about those you already have. They are there adding structure and substance for the long term. Another quality offering from the good doctor. Ground cover plants are ideal for cutting the work down.
Bare soil means extra weeding, so keeping it covered means less work and more interest to look at.
The usual high quality of illustrations and advice that characterise this excellent series of books.