Tithonia rotundifolia, commonly known as Mexican sunflower, is native to Mexico and Central America, but it flourishes in hot locations, dry to medium moisture and grows through much of the U.S. Place in plenty of sun. It’s adapted to poor soil. An annual, tithonia will reseed itself, but you can also collect seed and start transplants indoors next spring. Deadheading prolongs bloom of the 3-inch flowers. No disease or pest issues, including deer.