clipped from: www.pistachiohealth.com 
Pistachio orchards bear nuts in “alternate-bearing” cycles, i.e., their crop year is heavy one year and light the next. Trees require about 1,000 hours of temperatures at 45 degrees F or below for good production.
Hungry? Choose pistachios. Among nuts, pistachios are one of the most nutritious varieties. A one-ounce serving of pistachios, with 49 kernels and 160 calories, gives you more than 30 different vitamins, minerals, and other beneficial nutrients.