Trachycarpus fortunei, also known as windmill palm or Chusan palm, can add a tropical accent to your garden or home. The tree, which can grow up to 40 feet tall, produces green, fan-shaped leaves, and is held up by a single stem that can grow up to 10 inches in diameter. The windmill palm is a cold hardy palm that can successfully grow in California and other regions of the United States within U.S. Department of Agriculture plant hardiness zones 7b through 11. To successfully grow a windmill palm tree, start it from seed, right at home