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In recent years, the U.S. Department of Agriculture has generated  V. ashei  and  V. constablaei  derivatives to provide late-flowering, earlyripening rabbiteye germplasm for the southern U.S.; however, this germplasm has also performed well in New Jersey, and could potentially provide northern-adapted rabbiteye types. When combined, these germplasms complement each other in many respects. Crosses with varying percentages of  V. constablaei  germplasm ranging from 100% to 0%, in 25% increments, were evaluated for mid-winter cold-hardiness using a detached twig assay. Hybrids with 50% or more  V. constablaei  germplasm were hardy to –25° C or lower. Further backcrosses to  V. ashei  resulted in dramatic segregation for hardiness, but still yielded some progeny as hardy as typical northern highbush. Assays of rabbiteye cultivars have been recently completed to enhance the ability to generate cold-hardy hybrids. Recombination and selection have begun to yield hybrids improved for critical commercial characteristics, and further rapid progress is expected.

hortscience

Progress in Selection for Cold-hardiness, Adaptation, and Quality in Vaccinium ashei and Vaccinium ashei/V. constablaei Derivatives and the Potential for Northern-adapted Rabbiteye Cultivars