ZINNIA – Giant Cactus Mix The unique frilly-edged blooms of the cactus-flowered mix are massive – some up to 6”(15cm) diameter. Flowers come in a full range of colors and area carried atop a long, strong stems all summer and into fall. Use in mass plantings and mixed sunny beds. Excellent for cutting. Harvest flowers regularly to encourage reblooms. Annual. Full sun. Plants grow 30-36”/75-90cm.