- 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.
- Wendy F.Verified BuyerRated 5 out of 5 stars2/10/26Beautiful, soft colors
I planted these last year and loved the range of soft pinks and corals. I'll be tossing the seeds about in my front garden later this spring. They look gorgeous intermixed with white cosmos, multi-colored strawflowers, and blue bachelor's buttons. A light, airy bit of color.
Which best describes you as a gardener? IntermediateBIBotanical Interests2/16/26Hey Wendy,
Thank you so much for sharing your beautiful review of our Sea Shells Blend Cosmos Seeds! We're so glad all of your flower seeds are creating such a beautiful flower garden for you. We'd love to see photos. Thank you for choosing us and for sharing your growing experience with us. Keep on growing 🌻️
- JaniceRated 4 out of 5 stars2/8/26Nice
I only managed to keep one of these alive but it was nice.
Which best describes you as a gardener? BeginnerBIBotanical Interests2/16/26Hey Janice,
Thanks for taking the time to share your review of our Sea Shells Blend Cosmos Seeds! Your photo is beautiful and the color is so brilliant! Cosmos can definitely be a little tricky to get established sometimes, but when they take off, they're absolutely stunning. We're thrilled that you had success with at least one of them and that you enjoyed the results. We hope you'll give them another try. Thank you for choosing us and for sharing your growing experience with us. Keep on growing 🌻️
- Raudel M.Rated 4 out of 5 stars1/28/26Just beautiful
I’m zone 9 so i sowed these mid july, paired with dwarf zinnias. They started flowering in September-frost and they were stunning! Although they barely grew to about 3 feet and was aiming for 5, i was still mesmerized by these flower shapes colors/shapes! Definitely going to regrow them this spring to see if they reach their true height.
Which best describes you as a gardener? IntermediateBIBotanical Interests1/28/26Hey Raudel,
Thank you so much for taking the time to share your wonderful review of our Sea Shells Blend Cosmos Seeds! We're thrilled to hear how stunning they looked paired with your dwarf zinnias and that you were mesmerized by their beautiful shapes and colors! We're excited for you to try growing them again this spring to see if they reach their full height potential - sometimes timing and growing conditions can make all the difference! Thank you for choosing us and for sharing your growing success with us. Keep on growing 🌻️
- AdrienneVerified ReviewerRated 5 out of 5 stars11/25/25Lovely, fascinating, wish they were native.
So very pretty!!! Some taller than me! Lush bright greenery with very pretty two-toned pink tubular petaled-flowers. Bright yellow center. Cosmos always lovely but this version has a Very interesting flower! Friends are amazed by these, having never seen another flower like this! These don't last after cutting in a vase as long as single cosmos, who can last many days, these are a couple days in my experience. Now that I'm getting clued in on planting native I'm realizing would prefer to promote and pamper local plants for the local critters. But these seashell cosmos are really beautiful, unique, and easy to take care of, in Denver.
Which best describes you as a gardener? IntermediateBIBotanical Interests11/25/25Hey Adrienne,
Thank you so much for taking the time to share your experience with our Sea Shells Blend Cosmos Seeds! We love hearing that they grew taller than you and produced those stunning two-toned pink tubular flowers that have your friends amazed. We totally understand your point about the shorter vase life compared to regular cosmos, but it sounds like they're absolutely gorgeous in the garden. We also appreciate your thoughtfulness about native plants and supporting local ecosystems - that's such an important consideration for gardeners. Thanks for sharing your beautiful growing experience with us in Denver. Keep on growing 🌻️
- Lisa P.Verified BuyerRated 5 out of 5 stars11/15/25Beautiful!
This variety is gorgeous. I love the shape of the petals.
Which best describes you as a gardener? IntermediateBIBotanical Interests11/24/25Hey Lisa,
Thank you so much for taking the time to share your experience with our Sea Shells Blend Cosmos Seeds! They really are beautiful! It's wonderful that you're enjoying the gorgeous blooms this variety produces. Thanks for sharing your growing success with us. Keep on growing 🌻️