Pollination Flowers of fruit trees must be pollinated to pro duce fruit. Without sufficient pollination, they may blossom abundantly but will not bear fruit. How ever, many varieties cannot produce fruit from their own pollen. If the male pollen is shed before the female flower is receptive, fruit-set becomes a problem. Some species of fruit trees do not fit conveniently into either category.
Pistachios have male trees that produce pollen and female trees that produce fruit.
To grow them successfully, it is necessary to plant at least one male tree for every eight female pistachio trees. Most apple trees are self unfruitful. Golden Delicious', a self fruitful variety, and 'Jonathan' are the most common pollinators used. In general, a pollinator should be considered for all pear varieties, even though 'Kieffer' and 'Duchess' set good crops without pollinators. Most peach varieties are self fruitful.