When trees and shrubs from seedlings or rooted cuttings
are grown in containers, roots often begin to circle
on the outside of the rootball against the slick, smooth
plastic container walls. If not mechanically controlled
when the trees or shrubs are transplanted, circling roots
may enlarge to the point of stressing or killing the plant
by girdling (1). Internal walls of containers can be
coated with copper compounds such as Spin Out,