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Cosmos Seeds

a.k.a. Mexican aster

Cosmos bipinnatus, C. sulphureus

How to plant Cosmos seeds

Reasons why you'll love growing cosmos:

  • Cosmos are easy to start from seed, and will often self-sow.
  • Plants are easy to grow and maintain. Cosmos will grow in hot sun and poor soil, and will withstand drought conditions.
  • Cosmos are beautiful and diverse. Flowers come in an amazing variety of bright colors and unique styles. Plants grow as 12-inch dwarfs, 4-foot giants, and many sizes in between.
  • Flowers attract beautiful friends to our gardens: birds, bees, and butterflies love cosmos.
  • Cosmos look good most anywhere. In containers, flower beds and borders, or as cut flowers in your home.

Dwarf Cosmos

Smaller Growing Cosmos for Bedding and Containers.

Cosimo Series

Cosmos bipinnatus

Flowering in as little as 8-12 weeks from seed, the Cosimo series is one of the first cosmos to come into bloom. The heavy-flowering, 18-24 in. tall bushy and compact plants produce impressive masses of blooms. Flowers are excellent for cutting. Use Cosimo cosmos in garden beds or containers, where plants will bloom all summer long.

Apollo Series

Cosmos bipinnatus

The large, ruffled 4 in. blooms of Apollo series cosmos have an overlapping petal arrangement. The result is rounder, tidier, and longer-lasting flowers. The dwarf, 18-26 in.tall plants are bushy and branch freely. Apollo series cosmos excel in heat tolerance and disease resistance.

Sonata Series

Cosmos bipinnatus

Heavy-blooming, 2 ft. tall plants with large 3 in. flowers with gently frilled petal tips. Plants bloom from late spring into early autumn. Use the well-shaped plants of Sonata series cosmos to edge paths, mass in beds, blend into borders, or plant in containers.

Pop Socks Series

Cosmos bipinnatus

Pop Socks series cosmos produce marvelous single, semi-double, and anemone-shaped flowers throughout the season. Pop Socks cosmos grow 24-28 in. tall.

Cosmos for Backgrounds & Cut Flowers

Tall Cosmos with long, strong stems.

Double Click Series

Cosmos bipinnatus

Double Click series cosmos are free-blooming, 4 ft. tall flower machines from early summer until frost. The impressive large and frilly, semi-double to fully double flowers are excellent for cutting.

Sensation Type

Cosmos bipinnatus

Large 3-4 in. daisies with yellow centers bloom in summer and fall. Heavy-blooming, self-cleaning 3-5 ft. tall plants.

Psyche Series

Cosmos bipinnatus

Psyche series cosmos produce semi-double and single, 3-4 in. frilled and scalloped flowers with golden eyes. Plants grow to 4-5 ft. tall. We have become fans of Psyche series cosmos for their outstanding performance in our test garden.

Versailles Series

Cosmos bipinnatus

Tall 3-4 ft. tall plants produce a wealth of 4 in. wide blooms on long, strong stems. Versailles cosmos are superb cut flowers.

Sulphur Cosmos

Cosmos sulphureus

Tall or dwarf summer blooming annuals. Flowers are in highly combustible shades of orange, yellow, or scarlet red.

Dr. Allan Armitage discusses Cosmos bipinnatus.

How to Plant and Grow Cosmos

Bee introduces how to plant

Sow Cosmos: Sow cosmos seeds in cell packs or flats, 4 to 6 weeks before transplanting into the garden. Kept at 70 to 85° F., germination is in 7 to 21 days. Can direct sow cosmos into prepared seed beds in rows, after all danger of frost. Thin seedlings to 12 to 18 inches apart. A less efficient but easier method of sowing cosmos: scatter seeds. Rake seeds into soil, keep area moist until germination.

Tip for bringing your cosmos plants into bloom up to 3 weeks earlier, growing under fluorescent lights: once seeds have germinated provide 11 hours per day of artificial light. Keep seedlings in complete darkness for the remaining 13 hours. After 2 weeks, keep the lights on for 14 or more hours per day.

Grow Cosmos: Full sun. Plants tolerate heat, drought, and poor soil. Most blooms produced with moderate water in soils of average fertility. Remove spent blossoms to promote additional flowering. Will usually self-sow if some spent blossoms are kept on plants. Excellent cut flowers, last 7 to 10 days when blooms are cut as petals unfold. Flowers fully open in vase. Rarely bothered by pests or disease. Cosmos attract birds, bees and butterflies.

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