- Trees & Shrubs (Questions and Answers, #5)
- Perennials: Practical Advice and the Science Behind It (Question & Answer Series, 3)
- Hole's Dictionary of Hardy Perennials: The Buyer's Guide for Professionals, Collectors & Gradeners
- Roses: Practical Advice and the Science Behind It (Question & Answer Series, 3)
- Bulbs: Practical Advice and the Science Behind It (Questions & Answers, Vol 6)