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Roger Kjelgren was an associate professor of urban horticulture and director of the Center for Water-Efficient Landscaping in the plants, soils, and biometeorology department at Utah State University when this was written.
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Roger Kjelgren was an associate professor of urban horticulture and director of the Center for Water-Efficient Landscaping in the plants, soils, and biometeorology department at Utah State University when this was written.