(3 Gallon) TOP HAT Dwarf Blueberry Bush - amazing dwarf variety. self pollinating, prolific poducer of full-size, delectable fruit that can be eaten fresh or used for cooking. Cold hardy to -30 F. (3 Gallon) TOP HAT Dwarf Blueberry Bush - amazing dwarf variety. self pollinating, prolific producer of full-size, delectable fruit that can be eaten fresh or used for cooking. Very cold hardy to -30 F. Extremely nutritious and have a high vitamin and antioxidant content. Height Fully Grown 15-24in. Prolific producer of full-sized, delectable fruit. Hardy in zones 3-8. VERY COLD HARDY Self pollinating (does not need another plant for pollination), dwarf variety