Question
Hello,
My Pistacio Tree has nut shells with no nuts in them at harvest?The trees are 10 years old and no nut in the shell at harvest. This is 4-5 years now.
Thanks

Answer
Hi Chris,  Just a thought here do you have a male and a female tree?  Some info for you: The trees are planted in orchards, and take approximately seven to ten years to reach significant production. Production is alternate bearing or biennial bearing, meaning the harvest is heavier in alternate years. Peak production is reached at approximately 20 years. Trees are usually pruned to size to make the harvest easier. One male tree produces enough pollen for eight to twelve nut-bearing females..  Hope this helps as I do not have any other clue.