By Mary H. Dyer, Master Naturalist and Master Gardener Pistachio trees thrive in climates with hot summers and relatively cool winters. Although we think of pistachios as nuts, the delicious, nutritious treats are actually seeds. Pistachios belong to the Anacardiaceae plant family, which includes a number of familiar plants like mangos, cashews, smoke tree, sumac, and – believe it or not – poison oak. If you’re wondering how to harvest pistachios, it isn’t difficult. Read on to find out. How Pistachios Grow The pistachios we purchase in grocery stores have a hard shell, but we never see the outer hull, which is known as the epicarp. The epicarp adheres to the inner shell until the pistachio ripens, then it is removed. When to Harvest Pistachios Pistachios develop in early summer and ripen in late August or September nearly everywhere in the world, with the exception of Australia. In that case,
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