Rudbeckia hirta. This widespread wildflower is considered an annual to a short-lived perennial. In the right environment, it reseeds and regenerates. It grows 1-2 ft. in height. It has bright-yellow, 2-3 in. wide, daisy-like flowers with dark centers. Although native Black-eyed Susan has smaller flowers than hybrids, it is hardier. Plant in partial to full sun in average to moist soil. It also makes a great container plant and mixes well in wildflower beds.