Cosmos bipinnatus Seeds (Radiance Cosmos)

Radiance Cosmos (Cosmos bipinnatus) is a vibrant flowering plant belonging to the Asteraceae family. With its delicate fern-like foliage and stunning pink, white, or purple flowers, it adds a touch of elegance to any garden. Commonly known as Mexican aster or garden cosmos, Radiance Cosmos is an annual that blooms throughout summer and fall. With a height ranging from 12 to 60 inches, it is suitable for borders, containers, or cut flower arrangements. These easy-to-grow plants thrive in full sun and well-drained soil. Radiance Cosmos (Cosmos bipinnatus) seeds can be sown directly in gardens, and they are suitable for USDA hardiness zones 2-11.

Growing Cosmos bipinnatus from Seed

• Growth cycle: Annual
• Watering: Medium
• Sunlight: Medium Sun
• Suitable climates: Arid, Highland, Humid Continental, Humid Subtropical, Marine West Coast, Mediterranean, Semiarid, Subarctic, Tundra
• Where to grow: Outdoors
• Flower color: Pink

Germinating Radiance Cosmos Flower Seeds

To germinate Cosmos bipinnatus, start by sowing the seeds in a well-draining soil mix, keeping them moist but not overly wet. Place the seeds in a warm location with indirect sunlight, and expect germination within 1-2 weeks.

We source all of our Cosmos bipinnatus seeds from a small greenhouse facility based in southeastern Maine and store them in a dark, temperature-controlled environment before shipment. You’ll find that our fresh Radiance Cosmos seeds are much easier to germinate than the mass-produced packets of flower seeds found in stores! If you have any trouble growing Radiance Cosmos seeds, we’re happy to send you additional gardening tips. In the (unlikely) event that your Cosmos bipinnatus seeds do not germinate at all, we’ll give you a full refund, no questions asked.

We offer this variety on Etsy and eBay, as well!

Shipping & returns

Our complete shipping and return policies are available right here. Get free shipping on your order by adding additional seed packets to your cart!