RT Journal Article SR Electronic T1 Nursery Production Alternatives for Reduction or Elimination of Circling Tree Roots JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 383 OP 388 DO 10.48044/jauf.1993.060 VO 19 IS 6 A1 Bonnie Lee Appleton YR 1993 UL http://auf.isa-arbor.com/content/19/6/383.abstract AB Tree roots that circle during nursery production have the potential, once planted in the landscape, to enlarge and become girdling roots that may stress or kill trees. Several nursery production alternatives have been developed to address this problem including in-ground fabric, rigid plastic, and “potin-pot” containers, and above-ground modified rigid plastic, “low-profile”, “soil sock” and copper-treated containers. Coating the interior wall of rigid containers (above and in-ground) with the root-regulating copper compound appears to be the most effective and economically justifiable alternative.