1 3

Diablo Cosmos Seeds

Diablo Cosmos Seeds

2050

Organic
4.9
Rated 4.9 out of 5 stars
25

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.

$3.49
$3.49
Sale Sold out

~0.5 g

(~60 seeds)

Shipping calculated at checkout.
View full details
  • Variety Info
  • Sowing Info
  • Growing Info
  • Learn More

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

Non GMO Project

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, cut stems just as flower buds begin to open.

4.9
Rated 4.9 out of 5 stars
Based on 25 reviews
Total 5 star reviews: 22 Total 4 star reviews: 3 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Slide 1 selected
Search
Search Reviews
Rating
Ratings
Which best describes you as a gardener?
Which best describes you as a gardener?
Write a Review (Opens in a new window)
25 reviews
  • Ellen T.
    Verified Reviewer
    Rated 5 out of 5 stars
    7/23/25
    INSANELY 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.

    Was this helpful?
    Which best describes you as a gardener? Beginner
    BI Profile picture for Botanical Interests
    Botanical Interests
    7/23/25

    Wow, 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 Buyer
    Rated 5 out of 5 stars
    3/9/25
    5 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!

    Was this helpful?
  • Malia M.
    Verified Buyer
    Rated 4 out of 5 stars
    2/2/25
    4 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.

    Was this helpful?
  • Kori H.
    Verified Buyer
    Rated 5 out of 5 stars
    1/22/25
    5 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!

    Was this helpful?
  • Ann G.
    Verified Buyer
    Rated 5 out of 5 stars
    11/9/24
    5 Stars

    It's way too early to see the Cosmos, I'll plant the seeds in a few months. Thanks for the prompt order!

    Was this helpful?
    Which best describes you as a gardener? Expert