Helianthus is a genus that knows exactly what it wants: sunlight. In order to get as much sun as possible on their flowers heads, they've developed a remarkable ability to turn their faces toward the sun as it rolls across the sky each day. And overnight, they orient themselves eastward to great the sun first thing the next morning. Scientists believe this trick has to do with the plants' biological clocks working in tandem with certain growth hormones. Or just call it garden magic—sunflowers are bursting with it. With some well-draining soil, these hardy plants will produce pollinator-attracting blooms and tasty seeds for you and your avian friends.