Yes, coffee trees can be grown in the continental USA, but it is challenging due to the limited growing areas with the appropriate climate. Ideal coffee-growing conditions include a tropical or subtropical climate with moderate rainfall, high humidity, and temperatures between 60-70°F. These conditions are typically found in countries near the equator, but can also be found in certain areas of the southern United States, such as Florida and Hawaii.
In the mainland USA, coffee is primarily grown in the states of California and Texas. However, the coffee grown in these states is often considered specialty coffee and is grown on a smaller scale. Coffee grown in the USA typically faces challenges such as limited growing areas, higher production costs, and a shorter growing season compared to countries near the equator.