and landscapers in the United States.

In the United States, most of the warmer zones (zones 9, 10, and 11) are located in the deep southern half of the country, on the southern coastal margins, and on the Pacific coast. Higher zones can be found in Hawaii (up to 12) and Puerto Rico (up to 13). The southern middle portion of the mainland and central coastal areas are in the middle zones (zones 8, 7, and 6). The far northern portion on the central interior of the mainland