Pistachio trees are a bit like humans – they don’t reach maturity until they are in their teens and they can have a 100-year lifetime. Also, it’s the nature of most mature nut trees to have one on year and then one off year because fruit comes off second year wood and in the year they put all their energy into fruit and not new growth for the following crop. As result, production can vary significantly year to year."
Gary R. Smith, Ingleby United States