More Images *ILEX OPACA FOSTERI, Foster Holly Hardiness Zone: 6 Prices by Size: 4 ft., W.B. - $50.00 5 ft., W.B. - $60.00 6 ft. , W.B - $70.00 8 ft., W.B. - $100.00 [Your browser doesn't support IFrames. Click here to find the USDA hardiness zone for your zipcode.]