The most extensive orchards in the United States are apple and orange orchards, although citrus orchards are more commonly called groves. The most extensive apple orchard area is in eastern Washington state, while there are extensive orange orchards in Florida and southern California. A particular advantage of growing apples on the high plateau areas of Washington state is that it's possible to grow high-quality organic apples. The forest garden is a food production system that is closely related to the orchard. A move towards more ecologically-friendly coffee production has led to forest-garden production of coffee. Brazil nuts and rubber have been produced in such a method for years. Other important orchard crops in the United States include: