Comparison of Flower Bud Cold Hardiness of Several Cultivars of Rhododendron spp.12

in HortScience
Authors:
Norman E. PellettDepartment of Plant and Soil Science, University of Vermont, Burlington, VT 05405

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Mary A. HoltDepartment of Plant and Soil Science, University of Vermont, Burlington, VT 05405

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Abstract

Five evergreen rhododendron cultivars were compared for flower bud cold hardiness in laboratory freezing studies on 6 dates. ‘Roseum Elegans’, ‘Catawbiense Boursalt’ and ‘Boule de Neige’ were more cold hardy on most sampling dates than ‘America’ and ‘Lee’s Dark Purple’. The relative cold hardiness of these 5 cultivars was consistent on several winter dates over several years. Injured florets were black and readily separated from uninjured white florets upon dissection of the inflorescence bud after freezing.

Contributor Notes

Received tor publication March 16, 1981. Vermont Agriculture Experiment Station Journal Article No. 471.

The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

Partially funded by a grant from the Vermont Plantsmen’s Association.

Associate Professor and former Research Technologist, respectively.

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