1:30:59

Pruning

1:29:12

Diagnosis and Plant Disorder/Plant Health Care

19:55

The Surprising Map of Plants

25:11

Chapter 2 - Tree Biology & Physiology

1:05:58

Tree ID

16:15

Arborist Exam Prep: Chapter 1 - Tree Biology

1:28:26

Soil Science

26:43

Introduction to Plant Anatomy and Physiology