How to be sure that all that you plant is sufficently pollenated is always a consern. Here in the groves of trees the Ochard (Mason) bees are encougaed to collect pollen and lay their eggs. 1/4 to 5/16 inch holes are drilled in wood and hung on posts or trees. The small bees are solitary and can not drill their own holes. Without the medaling of humans, they would use hollow reeds. After enough pollen is collected and the eggs laid, a plug is applied to seal the end of the chamber. Then the next spring they will hatch to start the process again.
My favorite tree in the orchard is the Paw Paw. Its name is just fun to say and the flower buds are a wonderful brown, fuzzy knob. To top it off, the fruit is delicious, a kind of mango, banana cross. Paw Paw are well worth the wait to grow them.