Cosmos sulphureus Seeds (Orange Sulfur Cosmos)

Orange Sulfur Cosmos (Cosmos sulphureus) is a vibrant, eye-catching plant species commonly known as Yellow Cosmos or Orange Cosmos. Its distinct fiery orange blooms add a touch of warmth to gardens and attract pollinators. It grows as an annual plant, reaching a typical mature height of 2 to 4 feet. Ideal for USDA hardiness zones 3-10, Orange Sulfur Cosmos seeds can be sown directly in the garden in full sun and well-drained soil. With its easy-growing nature and striking appearance, these Cosmos sulphureus seeds are a popular choice for amateur and experienced gardeners alike.

Growing Cosmos sulphureus from Seed

• Growth cycle: Annual
• Watering: Medium
• Sunlight: Full Sun
• Suitable climates: Arid, Tropical Wet & Dry, Tropical Wet
• Where to grow: Outdoors
• Flower color: Orange

Germinating Orange Sulfur Cosmos Flower Seeds

To germinate Cosmos sulphureus, sow the seeds in a well-draining soil mix about 1/4 inch deep. Keep the soil consistently moist, provide bright light, and maintain temperatures around 70-75°F. Germination typically occurs within 7-10 days.

We source all of our Cosmos sulphureus 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 Orange Sulfur Cosmos seeds are much easier to germinate than the mass-produced packets of flower seeds found in stores! If you have any trouble growing Orange Sulfur Cosmos seeds, we’re happy to send you additional gardening tips. In the (unlikely) event that your Cosmos sulphureus 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

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