• Bright yellow sulphur cosmos flowers from Hudson Valley Seed Co. with delicate petals and green foliage on a natural background.
  • Bright yellow sulphur cosmos flowers from Hudson Valley Seed Co. with delicate petals and lush green foliage.
  • Bright yellow Sulphur Cosmos flowers in full bloom, showcasing delicate petals and green foliage, from Hudson Valley Seed Co.
  • Bright yellow sulphur cosmos flowers from Hudson Valley Seed Co. with delicate petals and green foliage.
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Hudson Valley Seed Co.

Sulphur Cosmos

Cosmos sulphureus

Conventionally Grown

The perfect scatter seed flower in rich deep golden hues.

These cosmos are wonderfully easy, drought-tolerant, and disease-resistant. A lacy-leaved and flat-bloomed answer to calendula (in the same terrific golden hues). The foliage is robust by late summer, forming a beautiful rounded clump of thin-leaved green that suggests dryland plants. Pairs well with Spider Flower (see photo).

Unit Price Quantity Availability
2,250 Seeds $13.79
Out of Stock
250 Seeds $4.39
In Stock
750 Seeds $7.79
In Stock

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Ships within 2-3 business days

Growing instructions
Easy to grow flowers with a bushy habit that tolerate semi-neglected conditions. Plant in an area where they will not shade out other plants, or mix them with other tall annuals such as zinnias, straw flowers, and sunflowers. Start indoors 6 weeks before last frost and transplant, or sow outdoors, after threat of frost has passed. Cosmos will tolerate being crowded, especially when grown with other flowers. Blooms are bright but delicate, and do not last long after cutting.
Product Details
Days to Maturity 90 days
Days to Germination 7 to 14 days
Width at Maturity 36 inches
Height at Maturity 48 inches
Hardiness Zone Range Annual
Sun Conditions Partial Sun (4-6 hours Sun), Full Sun (8+ Hours Sun)
Planting Depth 1/4"
Row Spacing 18 to 24 inches
Plant Spacing 18 to 24 inches
    Bright yellow sulphur cosmos flowers from Hudson Valley Seed Co. with delicate petals and green foliage on a natural background.
    Bright yellow sulphur cosmos flowers from Hudson Valley Seed Co. with delicate petals and lush green foliage.
    Bright yellow Sulphur Cosmos flowers in full bloom, showcasing delicate petals and green foliage, from Hudson Valley Seed Co.
    Bright yellow sulphur cosmos flowers from Hudson Valley Seed Co. with delicate petals and green foliage.
    • 5 stars: 3 (100%)
    • 4 stars: 0 (0%)
    • 3 stars: 0 (0%)
    • 2 stars: 0 (0%)
    • 1 star: 0 (0%)
    E
    Erin L.

    The past few years, I much prefer the shape and color of cosmos compared to calendulas. Cosmos also seem to be a bit more heat and storm tolerant. They look lovely growing in the garden with variegated nasturtiums.

    Erin L. review photo Erin L. review photo
    A
    Ayelet M.

    These cheery flowers started early and have kept going!
    It is October 6, 2022 and I just cut a bunch and have more buds about to open.

    Ayelet M. review photo
    J
    Jamie H.

    My absolute favorite. This Bumble bee also was thinking the same in the morning sun.
    We happen to raise honey bees and lots of pollinators love these flowers too.

    Jamie H. review photo