Eastern Black Walnut JUGLANS NIGRA Hardiness Zone: 4 Prices by Size: 1 1/2 in. Cal., W.B. - $70.00 2 in. Cal., W.B. - $85.00 2 1/2 in. Cal., W.B. - $100.00 3 in. Cal., W.B. - $120.00 [Your browser doesn't support IFrames. Click here to find the USDA hardiness zone for your zipcode.]