Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Asteraceae
Native
Mexico
Life Cycle
Annual
Plant Height
Tall (Greater than 24")
Flower Color
Orange
Bloom Season
Summer to frost
Further Information
Plant Characteristics
- Attracts Butterflies
- Attracts Hummingbirds
- Attracts Pollinators
- Cut Flower
Growing Conditions
Drought Tolerant
About ["Cosmos"]
Cosmos sulphureus
1–1½" bright, scarlet/orange blossoms
Planting ["Cosmos"]
Plant Spacing
A group of 3 seeds every 12"
Light Required
Full sun
Plant Height
Tall (Greater than 24")
Planting Depth
Barely cover
Planting Details
| Seed Depth | Barely cover |
|---|---|
| Seed Spacing | A group of 3 seeds every 12" |
| Thinning | When 1" – 2" tall, thin to 1 every 12" |
| Germination | 5–10 days |
| Start Indoors | 4 to 6 weeks before your average last frost date. |
| Direct Sow | RECOMMENDED. 1 to 2 weeks after your average last frost date, and when soil temperature is at least 60°F. |
| Growing & Harvesting | For longest vase life, cut stems just as flower buds begin to open. |
Find Your Frost Date & Grow Zone
Average First Frost Date
October 19
Average Last Frost Date
May 19
Your Hardiness Zone is
5b
Send Your Recommendation
Total 5 star reviews: 24 Total 4 star reviews: 3 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
Which best describes you as a gardener?
27 reviews
- YvonneRated 5 out of 5 stars2/3/26If you want something bright in early spring
Beautiful, so bright in orange that will light up your day!
Which best describes you as a gardener? IntermediateBIBotanical Interests2/3/26Hey Yvonne,
Thank you so much for taking the time to share your wonderful review of our Diablo Cosmos Seeds! The orange blooms in your photo are so vibrant and beautiful! It sounds like they're bringing exactly the kind of cheerful color you were hoping for in early spring. Thank you for choosing us and for sharing your growing success with us. Keep on growing 🌻️
- SarahRated 5 out of 5 stars1/21/265 Stars
Yay!! I have my Chiffon Zucchini back!! I had forgotten who sold them last year so had to skip a year of the best zucchini there is.....but I found them again this year. I won't forget, its the seed company with the prettiest seed packages that you want to frame and hang on your walls. Thank you Botanical Interests and Epic Gardening!! 🥰🩷💕
- Ellen T.Verified ReviewerRated 5 out of 5 stars7/23/25INSANELY prolific
I planted 12 starts in my garden and I am absolutely drowning in orange cosmos. I can’t keep up with them! Deadheading at least once a day, cutting for bouquets, and they just keep coming back more and more! They’re amazing.
Which best describes you as a gardener? BeginnerBIBotanical Interests7/23/25Wow, Ellen.
We're so glad your orange cosmos are so prolific. We hope you enjoy them for many more months! Keep on growing 🌻️ - John W.Verified BuyerRated 5 out of 5 stars3/9/255 Stars
The Cosmos seeds are greatness! The colors are bright and beautiful. Butterflies love them! Bees too! Butterfly populations have decreased by 20 percent. Bee populations are down as well. Help them recover today!
- Malia M.Verified BuyerRated 4 out of 5 stars2/2/254 Stars
I’m eager to get started with spring seeding, so no pictures and no way to review the outcome at this point. Your website is easy to navigate and enjoyed the ordering process easy. The seeds arrived without delay and I’m thrilled with the high quality box they arrived in.