Pecans are native to North America where they are cultivated today. Pecans are used in ice cream, baking and as a topping or filling for some entree recipes. Pecans are also a good snacking nut. Pine Nuts are native to the Mediterranean region and grow on trees, between the leaves of pine cones. Harvesting is quite laborious and expensive.
Pine nuts are a staple in Mediterranean and Middle Eastern cuisine.
Pistachio trees produce a green shell with purple skin. Pistachios are not only a popular snack nut but also used as an ingredient in many desserts. Pistachios are also used as a source of green food coloring. Walnuts are grown in California, France, Italy, China and Chili. They are used in baking, snacking and are also an important source for salad oil.