Pine nuts aren't farmed; they're harvested from forests. The nuts are hidden inside the cones of certain species of pine, such as this pinyon in Utah's Fishlake National Forest.
Where In the U.S. do people say pee-kahn over pi-kahn? Joshua Katz answered your burning question by mapping Bert Vaux's dialect survey on regional variations in the continental United States.
Courtesy of Joshua Katz