BETULA, Dura Heat Birch Hardiness Zone: 5 Prices by Size: 5 to 6 ft., W.B. - $20.00 6 to 8 ft. , W.B. - $30.00 8 to 10 ft., W.B. - $40.00 10 to 12 ft., W.B. - $70.00 12 to 14 ft. , W.B. - $85.00 14 to 16 ft., 2" Stem, W.B. - $90.00 [Your browser doesn't support IFrames. Click here to find the USDA hardiness zone for your zipcode.]