- Schmitt, David J.
University of Maine Graduate School
Twenty-nine provenances of black walnut, Juglans nigra L. were planted as 1-0 stock in May, 1980 near Newport, Maine. The provenances were evaluated for height growth, dates of bud burst and bud set, length of dominant shoot, and amount of winter damage suffered. All of the above variables were correlated with elevation, latitude, and longitude of the original seed source.
Significant variation between the provenances were found for height growth, date of bud set, and length of dominant shoot. For all of the above there was significant negative correlation with elevation and/or latitude of the seed source. It is concluded that some provenances can be recommended for planting in Maine.