- To Speak for the Trees: My Life's Journey from Ancient Celtic Wisdom to a Healing Vision of the Forest
- The Global Forest: Forty Ways Trees Can Save Us
- A Garden for Life: The Natural Approach to Designing, Planting, and Maintaining a North Temperate Garden
- The Sweetness of a Simple Life: Tips for Healthier, Happier and Kinder Living from a Visionary Natural Scientist
- Arboretum America: A Philosophy of the Forest