There are several perennial genera of the Daisy Family known for golden-yellow flowers in summer (Coreopis, Helianthus, Heliopsis, Rudbeckia, and Solidago are among the common ones, with Gaillardia and Helenium having yellow-flowering cultivars). Perennial Sunflower is best placed at the rear of sunny perennial beds (growing to three feet tall and wide) or in naturalized situations.