Botanical Interests
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Product Details
Product Details
Vibrant, bold blossoms on tall stems make a big statement in the garden. Cosmos put on a big show from midsummer until first fall frost, providing pollen and nectar for bees, hummingbirds, and butterflies. Grows loads of cut flowers for your bouquets. A great choice for wildflower areas, as they are drought tolerant and practically care-free. A 1974 All-America Selections winner.
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- Variety Info
- Sowing Info
- Growing Info
Variety Info
Family: Asteraceae
Type: Cosmos (Learn more)
Native: Mexico
Hardiness: Annual
Exposure: Full sun
Bloom Period: Summer to frost
Plant Dimensions: 4'–5' tall
Variety Info: 1–1½" bright, scarlet/orange blossoms
Attributes: Attracts Hummingbirds, Attracts Butterflies, Attracts Pollinators, Cut Flower, Drought Tolerant
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.
Sprouts in: 5–10 days
Plant Seeds (Depth): Barely cover
Space Seeds: A group of 3 seeds every 12"
Thinning: When 1" – 2" tall, thin to 1 every 12"
Growing Info
Harvesting: For longest vase life, cut stems just as flower buds begin to open.
- Beth R.Verified BuyerRated 5 out of 5 starsAug 21, 2026Grew fast and self-seeded!
Love these cosmos. The leaves are different the traditional cosmos, love the look. But the colors are so pretty and they grew fast! They outperformed the other cosmos I planted by a mile. I found a Monarch butterfly on them the other day too! Will definitely purchase again.
Which best describes you as a gardener? IntermediateEGEpic GardeningAug 28, 2026Hey Beth,
We're so stoked to hear that your Diablo Cosmos have been such a fantastic success! It's awesome that you're loving those unique leaves and the gorgeous colors, and we're really impressed that they grew so fast and outperformed your other cosmos by a mile. Plus, attracting a Monarch butterfly? That's the cherry on top! Thanks so much for being part of the growing community! Keep on growing 🌻
- Denise W.Verified BuyerRated 5 out of 5 starsJun 19, 2026Bushy & Colorful
Beautiful bright colors! Tall and Whimsical! They grew fast!
Which best describes you as a gardener? IntermediateEGEpic GardeningJun 24, 2026Hey Denise,
We're so thrilled to hear about your amazing Diablo Cosmos success! It sounds like they really delivered with those beautiful bright colors and that tall, whimsical growth you got! Fast-growing cosmos are always so exciting to watch as they shoot up and start showing off those gorgeous blooms. There's something so magical about cosmos swaying in the garden with all that vibrant color! Thanks for sharing your fantastic Diablo Cosmos experience with us! Keep on growing 🌻️
- YvonneRated 5 out of 5 starsFeb 3, 2026If 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? IntermediateEGEpic GardeningFeb 3, 2026Hey 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 🌻️
- John W.Verified BuyerRated 5 out of 5 starsMar 9, 20255 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!
- Kori H.Verified BuyerRated 5 out of 5 starsJan 22, 20255 Stars
These are amazing! Pick a sunny spot. Throw out the seeds a week after your last frost and enjoy the show! Plant early for blooms all summer. Sow again in June for blooms all fall. Thousands of flowers and the butterflies loved them!
