Four annual cultivars, Celosia cristata L. ‘Castle Pink’, Impatiens Wallerana Hook. ‘Super Elfin Red’, Pelargonium × domesticum L.H. Bailey ‘Ringo Scarlet’ and Tagetes patula L. ‘Discovery Yellow’, and two perennial cultivars, Chrysanthemum × superbum Bergmans ex J. Ingram ‘Alaska’ and Coreopsis lanceolata L. ‘Early Sunrise’, of bedding plants were grown in a greenhouse for about 40 days in 0.3-1 (3.5 in.) containers treated with 25, 50, or 100 g Cu(OH)2/l (approximately 1.8, 3.5, and 7% (wt/wt), respectively) formulated as Spin OutTM or in non-treated containers. Following greenhouse production and a 4-day acclimation period in a shade-house, the plants were transplanted to a field plot. Cupric hydroxide concentrations that resulted in practical levels of control and/or elimination of root deformation (circled, kinked, and matted roots at container wall-media interfaces) were species dependent, varying between 25 and 100 g/1 (1.8 and 7%). During greenhouse production Cu(OH)2 treatments of 50 or 100 g/1 (3.5 or 7%) increased the vegetative growth of C. cristata and increased the number of flowers on I. Wallerana compared to plants in non-treated containers. After field planting, P. × domesticum grown in 50 or 100 g Cu(OH)2/1 (3.5 or 7%) and I. Wallerana in 100 g Cu(OH)2/1 treated containers had increased vegetative growth. The flowering potential of I. Wallerana was increased by the 50 g Cu(OH)2/1 (3.5%) treatment following field planting.

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Author notes

Tennessee Technological University College of Agriculture and Home Economics manuscript number 45. Funding, in part, for this project was supplied by a grant from the Griffin Corporation, Valdosta, GA. Appreciation is expressed for assistance on portions of this project by G. Renee Simms.

2Assistant Professor. Present address: Department of Horticultural Sciences, Texas A&M University, College Station, TX 77843-2133.

3Professor.

4Horticulturist.