Diablo Cosmos Seeds

Organic, Heirloom

4.9090909090909 out of 5 stars
(11 reviews)
Availability: In Stock
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.
$2.69 500 mg (~60 seeds)

Botanical Name: Cosmos sulphureus

Family: Asteraceae

Native: Mexico

Hardiness: Annual

Plant Dimensions: 4'–5' tall

Variety Information: 1–1½" bright, scarlet/orange blossoms

Exposure: Full sun

Bloom Period: Summer to frost

Attributes: Attracts Hummingbirds, Attracts Pollinators, Cut Flower, Drought Tolerant

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"

Harvesting: For longest vase life, cut stems just as flower buds begin to open.

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Diablo Cosmos Seeds Reviews

11 reviews

Most fun cosmos!

5 out of 5 stars Jul 25, 2018
Year after year, these come back from seed (I always add more too!) - the finches love the seeds - the plants grow 5' tall and are covered with bright yellow and orange flowers - the foliage alone is wonderful in flower arrangements. I deadhead some and toss them to the ground but the birds love the seeds. I won my first blue State Fair ribbon with one of these delightful flowers!
KristinThompson from NM

Beautiful blooms on tall plants, even in only 4 hours of sun

5 out of 5 stars Jun 30, 2019
This is the 2nd year I've grown these. The bees love the orange and yellow blooms. The new area I sowed these only gets about 4 hours of sun, and they look just as good as the more sunny areas. Dark green lush foliage that does a good job of blocking out sunlight for any weeds. Diablo Cosmos and California Giants Zinnias are my two favs from this vendor. EVERYTHING germinates.
Keith Y from TX

Diablo Cosmos seeds

5 out of 5 stars Sep 6, 2019
Loren Miller from NE

Beautiful and sturdy

5 out of 5 stars Jun 11, 2021
I sew Diablo Cosmos seeds in the small containers in early Mar. They started blooming in mid May, at the height of 30". I don't think they will grow higher up to 4-5feet in the small containers and this is what I really enjoy. Grow them in the full sun and move the containers to the shade so the shady area can be bright with these lovely tiny flowers. They are sturdy, no need stakes, their leaves are flat parsley-like. Their petals are concave like clam shells and long lasting. Thanks to Botanical Interest for this great pack. It makes summer in this hot zone 10 cheerful.
Thimy N. from CA

Gorgeous Flowers

5 out of 5 stars Nov 1, 2021
I direct sowed these in a raised bed in April. I still have flowers November 1 and the bees love them.
Lori from AL

Diablo Cosmos

5 out of 5 stars Nov 5, 2021
Wonderful! How beautiful these were! I saved a lot of seeds for next year, I love these flowers.
Keri from CO

Gorgeous, huge pollinator magnets

5 out of 5 stars Nov 18, 2021
I'm a novice gardener with a challenging conditions, but these performed spectacularly in spite of full baking sun, consistent temps in excess of 90 degrees F, high humidity, clay soil, and erratic irrigation. They reached about 4' tall and 3' wide, even without pinching. Each plant was dense and covered in blooms from July through our first hard frost in November. When I finally cut them down, I had to use loppers because the stems were an inch thick at the base. The bees and butterflies were crazy about them. I had to tie them back because they got so big they were blocking our walkway! But absolutely stunning and very easy to grow. Will definitely grow them again next year!!!
Amie from TN

Diablo cosmos

4 out of 5 stars Dec 5, 2021
Got about six plants to sprout. Flowered and did very well!
Michelle from IN

One of the best Cosmos

5 out of 5 stars Jan 15, 2022
Started a few indoors in mid-March. Those that were started indoors bloomed nicely and self-seeded so I soon had a second batch come up that grew stronger and more sturdy than the early transplants. So, this year I will again start a few on March 20 and when I plant them outdoors, I'll sow seeds at the same time for sturdier plants to follow the less sturdy ones that were started indoors to give early color.
Barbara from PA

Amazing Plants With Beautiful Flowers

5 out of 5 stars Jan 16, 2022
In 2021 I wanted to grow more to draw in more pollinators, especially more bees, and these plants excelled in doing that. I direct sowed them in a raised bed in late March and got waves and waves of orange and yellow flowers even now in January 2022, they grow quite large so make sure to provide enough space for them, and they self seed so easily that I had cosmos growing everywhere. I will definitely grow this variety again later this year.
Andy from CA

Beautiful flowers

5 out of 5 stars Feb 17, 2022
I love these flowers so much, I will be ordering more for my garden. They are so cheerful and add so much to my flower garden
Joni from CA

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