This is one annual that I seed every year. About 6 years ago I got a seed tape and did a hedge of them that ran along the property line. They are very pretty, super easy to seed (direct sow, wintersow or start early 4 weeks before last frost)
The neat thing about them is the entire flower, including the stamens, are one solid color. They do best in full sun and rang in height from 2 feet to 4-1/2 feet.