Hawaii - Macadamia nuts one of the state's top crops.

Macadamia nuts are grown by 650 to 700 independent farmers in Hawai'i. Since trees were first planted in the 1940s, they have become one of the state's top crops. Mac nuts are a popular snack, selling in local stores for about $4 for 5 ounces, and are considered a gourmet addition to cookies, coffee, ice cream and other goodies. Most U.S. mac-nut exports go to Japan, with most of the remainder to Canada, South Korea, France, the Netherlands and Hong Kong, according to the U.S. Department of Agriculture.