Zinnia gardens offer vibrant and low-maintenance ... Examples of double-flowered cultivars include 'Purple Prince,' 'Dahlia Flowered Mix,' and 'Benary's Giant Lime.' Semidoubled-Flowered Zinnias ...

This dahlia, grown from seeds instead of tubers ... they resemble those of a spider chrysanthemum or a cactus-flowered zinnia. It grows five feet tall and its flowers are five inches across.