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The Effect of Temperature, Photoperiod, and Freeze Treatment on the Morphology of Chrysanthemum X morifolium Ramat. ‘Astrid’1


More rhizomes were initiated by plants of ‘Astrid’ chrysanthemum grown in short day and cool air temperature than in long day and warm air. Rhizome development was greatest, shoot growth was enhanced, and root length and dry weight increased with warm compared to cool soil temperature. Rhizomes grown at a cool soil temperature either in long or short days had the least cellular injury after exposure to –8°C.