If you have been searching for the perfect plant for your kingdom on our site, you may have noticed the "USDA Zone" mentioned for each listing. The "USDA Zone" is referring to the USDA Plant Hardiness Zone. Gardeners, growers, and homeowners all over the nation use the USDA Hardiness Zones to determine if their desired plants will grow and thrive in their location. You can check which zone your castle is in by going to the USDA page and typing in your address or location into the bar on the upper left. For reference, all the plants that Royalty Plants offers were grown in Florida in zone 9.