Trees are many things: massive pumps, temperature exchanges, air purifiers, and more. Learn about the dynamics of tree life and their architecture. Instructor Joel Koci explains their complex lives. Take a walk in the Garden with Joel to discuss various trees and how they function. Joel Koci is a board certified master arborist, and holds a Masters in Ornamental Horticulture from Virginia Tech. He is a certified Chesapeake Bay Landscape Professional and an extension agent in urban forestry at Virginia State University.