'Eloquent prose and deeply perceptive paintings.'
– Cygnus Review

'An attractive, well-illustrated, and rewarding book that explores the relationship between humanity and trees...richly enhanced with photographs, sketches, drawings, and appealing, colorful paintings and watercolors. It is sturdy and attractive and Hageneder coherently presents a wide range of information on trees and related subjects.'
– New Age Retailer

'Hagender's passion for his subject and the wealth of scientific fact, historical information, and traditional lore he gathered in the process have resulted in a virtual arboretum of 24 of the most common, best-loved trees of Europe and North America, presented with stunningly beautiful paintings, drawings, and photographs.'
– Napra Review

'How pleasant to be able to review a book so delightfully informative and thoughtfully inspiring as this one! The Spirit of Trees captures each of these themes in a beautifully illustrated, well printed and fluently written text. This is a book that has been sorely needed. General readers and specialists alike will find much within in its pages for stimulation, reflection and refreshment.'
– Peter Barlow, Department of Biological Sciences, University of Bristol