- Variety Info
- Sowing Info
- Growing Info
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Variety Info
Family: Asteraceae
Type: Cosmos (Learn more)
Native: Mexico and Arizona
Hardiness: Annual
Exposure: Full sun
Bloom Period: Summer to frost
Plant Dimensions: 3'-5' tall, 18"-36" wide
Variety Info: 3"–4" solid colored (and a few bi-colored) blossoms of white, pink, rose, and crimson, with rolled, quilled petals surrounding yellow centers
Attributes: Attracts Hummingbirds, Attracts Pollinators, Cut Flower, Drought Tolerant, Deer Resistant
Sowing Info
When to Sow Outside: RECOMMENDED. 1 to 2 weeks after your average last frost date, and when soil temperature is at least 60°F.
When to Start Inside: 4 to 6 weeks before your average last frost date.
Days to Emerge: 5–10 days
Seed Depth: Barely cover
Seed Spacing: A group of 3 seeds every 12"
Thinning: When 1" – 2" tall, thin to 1 every 12"
Your hardiness zone is
Growing Info
Harvesting: For longest vase life, harvest in the morning and cut stems just as flower buds begin to open.
- Stephanie V.Verified BuyerRated 5 out of 5 stars11/4/25Fall blooms in zone 10a
Such a joy
Which best describes you as a gardener? BeginnerBIBotanical Interests11/6/25Hey Stephanie,
Thank you so much for this fantastic 5-star review! "Such a joy" with fall blooms in zone 10a is exactly what we love to hear about Sea Shells Blend Cosmos Seeds - and we absolutely love that you've discovered how these unique shell-shaped petals can bring such happiness to your garden during the fall growing season!
That's exactly the kind of delightful experience that makes Sea Shells Blend Cosmos such garden treasures! There's nothing quite like having cosmos that bloom beautifully in warmer zones during fall months, providing those distinctive fluted, shell-like petals in gorgeous mixed colors that create such a joyful display when other flowers might be winding down!
Your fall blooming success in zone 10a will be so inspiring for other warm-climate gardeners who want to discover just how rewarding and cheerful Sea Shells Blend Cosmos Seeds can be for creating those unique, shell-petaled displays that bring pure joy to the garden during extended growing seasons!
Keep on growing 🌻️
- Eric W.Verified BuyerRated 5 out of 5 stars3/9/255 Stars
Just planted these today but I love the variety and have confidence they’ll germ.
- LISAVerified BuyerRated 5 out of 5 stars2/28/255 Stars
Amazing seeds
- LISARated 5 out of 5 stars2/28/255 Stars
Amazing seeds
- maureen w.Verified BuyerRated 5 out of 5 stars11/14/245 Stars
They were a great flower for late in the summer. Monarchs were drawn to them.
Which best describes you as a gardener? Beginner