Zinnias are easy-to-grow annuals that produce brightly colored flowers in a wide range of sizes and shapes. To care for your zinnias, start by planting them in well-draining soil in an area that gets full sun. Water them regularly, making sure not to overwater, and fertilize them every two weeks with a balanced fertilizer. Deadhead the flowers as they start to fade to encourage more blooms, and pinch back the stems to promote bushier growth. Zinnias are generally pest and disease resistant, but keep an eye out for any issues and address them promptly. Enjoy the colorful blooms all season long!