Outsidepride Aster Gremlin Lavender Flower Seed - 1000 Seeds Aster Gremlin Lavender Blue grows as an annual in USDA Zones: 3 - 9. It thrives in full sun to partial shade areas. Callistephus Tall Double Lavender Blue, also known as Tiger Paw flower has large double blooms from mid summer to fall and long stems making it a wonderful cut flower. These tall heirloom flowers reach a height of 30 inches and are perfect as container plants or in a flower garden and are very attractive to butterflies. Sow these heirloom seeds in well-drained soil at 3 - 5 seeds per plant and keep moist until germination occurs in 7 - 21 days. Our seeds are always Non-GMO and packaged for the current year.