Abstract
Abstract Dianthus caryophyllus L. cvs. DWF White #1, Scania and Crowley's Pink Sim were grown in greenhouses covered with new corrugated fiberglass reinforced plastic panels (New FRP), single layer UV-resistant polyethylene (Sgl Poly), air inflated double layer polyethylene (Dbl Poly), and 8-year-old weathered corrugated fiberglass reinforced plastic panels (Old FRP). Total flower production in the New FRP, Dbl Poly and Old FRP cover treatments was 1.9, 21.8 and 56.5% less, respectively, than in the Sgl Poly treatment. Significant interactions were noted between cultivar fresh weights, stem lengths, grades and cover treatment. Increase of irradiance in the cover treatments reduced return crop times while increasing stem length, fresh weight and grade.
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