Growth of Coreopis and Plumbago in Plastic and Cu(OH)2-Impregnated Fiber Containers

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  • 1 Associate professor, University of Georgia, Department of Horticultue, Coastal Plain Experiment Station, Tifton, GA 31793.

A study was conducted with Coreopsis verticillata L. `Moonbeam' and Plumbago auriculata Lam. to evaluate the growth of these perennial plants in 2.6-liter (#1) black plastic containers (BPCs) compared to plants grown in fiber containers with Cu(OH)2 (FCs+) impregnated into the container walls. Coreopsis root and shoot dry weight was unaffected by container type, whereas Plumbago root and shoot dry weight was greater (2.2× and 1.6×, respectively) for plants grown in FCs+ compared to BPCs. The root : shoot ratio of Plumbago increased 30% when plants were grown in FCs+ compared to BPCs. Root circling was effectively controlled for both species grown in the FCs+. FCs remained in salable condition for the duration of the study. In contrast to untreated FCs, FCs+ will have to be removed at transplanting to allow for normal root development.

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