The textbooks of forest gardeners, these tomes are for the serious student of forest gardening. They cover every aspect of design, and compile a huge amount of information. Vol. 1, ‘Vision and Theory for Temperate Climate Permaculture,’ examines the current understandings of ecology and the relationships in natural ecosystems, and the way they apply to forest gardens. It includes a list of the top 100 forest garden plants for North America. Vol. 2, ‘Ecological Design and Practice for Temperate Climate Permaculture,’ includes design methods and best practices for both small and large-scale forest garden design. They have extensive appendices which aid in the selection of useful plants.