Vast numbers of radiant 2 in. double and semi-double, intense orange summer flowers attract butterflies. The heat and drought tolerant, well-proportioned, space-saving plants grow 12-20 in. tall.
Cosmic Orange cosmos is an All-America Selections Winner.
Growing Cosmic Orange Cosmos Seeds
Sow Sulphur Cosmos: Sow seeds in cell packs or flats, 4 to 6 weeks before transplanting into the garden. Kept at 70 to 85° F., seedlings emerge in 7 to 21 days. Can direct sow Sulphur cosmos seeds after all danger of frost into prepared seed beds in rows, 4-6 seeds per foot. Thin seedlings to 10 to 15 inches apart. A less efficient but easier method of sowing cosmos: scatter seeds. Rake seeds into soil, keep area moist until germination.
Grow Sulphur Cosmos: Full sun. Best flower production is in soils of average fertility with moderate water. Sulphur Cosmos tolerate heat, drought, and poor soil. Remove spent blooms to promote additional flowers. Sulphur Cosmos will usually self-sow if some spent blossoms are kept on plants. Cut flowers typically last 5 to 9 days when blooms are cut as petals unfold. Flowers fully open in vase. Sulphur Cosmos attract birds, bees and butterflies and are rarely bothered by pests or disease.
U.S. Shipping Rates
Free shipping on U.S. orders over $45.00.
Free priority shipping on U.S. orders over $125.00.
Standard U.S. shipping is $5.99.
Priority U.S. shipping is $9.99.
International Shipping Rates
Shipping to Canada is $9.99.
International shipping to all other countries is $14.99.
We guarantee all the seeds we sell for one full year from the date of purchase. If you are unsatisfied with any seeds purchased from Swallowtail Garden Seeds, we will issue a refund. For customers in the U.S., we can send one-time replacement packets or issue a refund.