Thank you for such an informative explanation of the storing temperature and the list of how long seeds should last if stored properly. Hot weather and hot soil are the triggers that get cosmos seeds going. and now in Petaluma, Ca. Cosmos (Cosmos spp.) We are located in Mansfield, Mo. Cosmos seeds should be sown between March and April for the best results. Cosmos seeds should be sown into a small tray, filled with compost, about 3mm deep and watered in, cover with a sheet of glass or polythene and keep the seeds in a warm place (about 15 to 25 °C) such as a greenhouse or warm windowsill. Sow cosmos after your last spring frost. Depending upon the type of seeds, environmental conditions, and the manner in which the seeds have been stored, the germination rate of older seed packets may be greatly impacted. I hope this information has helped you to understand how easy it can be to grow Cosmos flowers from seed. The Sunflower and Cosmos Seed Combo puts together two of the most iconic summer blooms. is a moderate reseeder, which means that it drops plenty of seeds to bring it back year after year without becoming an uncontrollable nuisance. It takes about 50 to 55 days for the seeds to germinate, grow and start blooming. Sow the cosmos seeds directly just before the last frost. Start indoors 6 weeks before last frost and transplant, or sow outdoors, after threat of frost has passed. Cosmos will last 7 -10 days in a vase and combine beautifully with other tall plants such as Ammi, Malva, Nicotiana and Cornflowers. October 31, 2016 / 0 Comments / in Heirloom Vegetables , Gardening Tips , Planting , Seed Saving , Vegetable Gardens , Wildflowers / by Sandy Swegel by Sandy Swegel This effortless combination attracts butterflies and hummingbirds to the garden all season long and makes for cheerful summer bouquets. There are various simple tests for viability. Cosmos seeds are relatively large and easy to handle, and can be sown in heat in April. I sow both in seed trays in March and April, pricking the seedlings out into plugs or pots and planting them out when the last hint of frost has gone. In fact, some seeds, if properly stored, can be viable even after ten years. Care Tips: Stake and tie Cosmos plants if necessary during the growing season, water regularly and dead-head to prolong the flowering season. Prepare the bed by turning the soil under to a depth of 8 inches. This group of plants belong as members of the huge sunflower or daisy family (Asteraceae), and are closely related to Coreopsis and marigolds. Direct sow seeds in average soil in full sun after danger of heavy frost. Cosmos sulphureus plant leaves resemble those of marigolds (member of the Compositae, to which Cosmos belongs). Growing Cosmos flowers. Cosmos are beautiful as a cut flower and will last for a long time if they are cut right after the blooms open. Cosmos come in nearly every color and produce large blooms throughout summer. I started mine inside last year on Apr. ). Seeds: Each flower will produce narrow achenes, similar to the way sunflower seeds are produced. How Long Do Seeds Last? You can also harvest the seeds to plant next spring. I live in zone 6, Boston area. Cosmos will tolerate being crowed, especially when grown with other flowers. Also, if you planted in the spring, you can cut your cosmos back to 12 to 18 inches after it stops blossoming. I haven't grown cosmos before, but seems like a long time for germination. Sowing, Seeds, Planting: Plant out after the last frosts. Cosmos Seeds on Sale: https://www.edenbrothers.com/store/cosmos_seeds.htmlTall, short, and lots of new colors, too. When the spring-planted cosmos begins to look as if there are an abundance of dried seed pods, do not remove the plants -- encourage re-bloom simply by cutting the plants back to 12 - 18 inches high. 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