How Improper Tree Trimming Impacts Tree Physiology

What's wrong with my pine tree…? Nothing! – The Garden Professors™

Ailanthus altissima

Basic Principles of Pruning Woody Plants

Proper Pruning - Trinity Tree Service, Inc.

Training and Pruning Apple Trees, VCE Publications

Chapter 3: The Benefits (and Disadvantages) of Trees – Tree Steward Manual

Forestry, History, Types of Forests, Techniques, & Aims

Tree Physiology Primer – All About Roots!

Pruning classifications

What is a Tree? How Does it Work?, Colorado State Forest Service