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Root girdling and deformation are problems that occur in containerized woody ornamentals. Two small trees, the coarse-rooted  Magnolia × loebneri  `Leonard Messel' (grown in 5-gal containers), and the fine-rooted  Crataegus × viridis  `Winterking' (6' bare root), were transplanted into 10-gal containers, some of which were treated with “SpinOut” [a latex paint containing 100 g Cu(OH) 2 /liter]. The plants were grown in a pot-in-pot system for 3 months, after which new roots were analyzed for mat formation and branching pattern. No significant differences in shoot growth that could be attributed to the Cu(OH) 2  treatment were observed. The treated containers prevented both root encirclement and reformation of matted roots, and resulted in a more-dense and fibrous root system than that observed in untreated containers. The differences were greatest with the coarse-rooted magnolia. The use of containers treated with copper compounds may be an effective means to reduce root problems commonly observed in modern containerized ornamental production.

Cu(OH)2 Affects the Growth and Root Structure of Two Woody Ornamental Species