So much of what makes a tree long-lived, strong, and healthy starts in the days and weeks after germination. The root’s emergence from the seed lays down the permanent structure that will hold the tree for its whole life. Trella concentrates on growing roots that are strong and healthy with ideal structural formation. We use an air pruning system to accomplish this. The growing surface is a wire mesh-topped table elevated off the floor and the trays don’t have any solid plastic surfaces. The air gaps in each growing cell prevent roots from circling and direct them out of the container. Each time a root leaves the media it dies and regrows inside the media. This creates a denser root mass with lots of branched roots – an ideal root system even with tap-rooted species like oaks.