Here is an excellent article, complete with video, about growing and harvesting pistachios. I never realized that they use a grafting process to make sure the plant will be healthier and resistant to disease.

And another shorter clip from youtube that shows the machinery involved at one pistachio harvesting location.:
http://www.youtube.com/watch?v=LQexHPC7UpI

And finally, a third source for harvesting, which also includes information on the processing of the pistachios.
Source(s):
http://www.pistachiohealth.com/consumer/about-pistachios/growth-cycle
http://www.youtube.com/watch?v=LQexHPC7UpI
http://www.roasted-pistachios.com/harvest-and-processing.php


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