Some blueberry varieties need cross-pollination ('Brightwell,' 'Tifblue,' 'Misty,' 'Sharpblue,' 'Chippewa,' 'St. Cloud' and 'Powder Blue'). Others do not have this need and are self-pollinating. Though companion plants will encourage better cross-pollination, they are not necessary. Nevertheless, it does not hurt to give your blueberry bushes a healthy nudge to cross-pollinate.