Seed Propagation Protocol for Pure and Hybrid Butternut (Juglans cinerea L.)
Butternut (Juglans cinerea L.) is a native, eastern North American hardwood tree with economic and ecological value. It is severely threatened by butternut canker disease, which is rapidly killing the species range-wide. Hybrids of butternut and butternut canker-resistant Japanese walnut (Juglans ailantifolia Carr.) have been proposed as an alternative to planting pure butternut. Information on pure and hybrid butternut seed harvest, preparation, stratification, germination, planting, and initial seedling care is lacking. Methods and results are described from a project growing these species at Purdue University, forming a seed propagation protocol for the species. Germination was first observed 14 days after stratification. After 17 days, 64 percent of seeds germinated using the current method. Alternate methods to those used in this project are provided when possible, so growers can tailor protocols at different scales.
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Author(s): Andrea N. Brennan, Douglass F. Jacobs
Publication: Tree Planters' Notes - Volume 63, Number 1 (2020)