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Cosmos Plant Care Guide

Cosmos_atrosanguineus_flower_at_Geilston_Garden

Cosmos is a genus, with the same common name of Cosmos, of about 20–26 species of flowering plants in the family Asteraceae.

Cosmos is native to scrub and meadowland in Mexico where most of the species occur, Florida and the southern United States, Arizona, Central America, and to South America in the north to Paraguay in the south.

Cosmos are herbaceous perennial plants growing 0.3–2 m (10 in–6 ft 7 in) tall. The leaves are simple, pinnate, or bipinnate, and arranged in opposite pairs. The flowers are produced in a capitulum with a ring of broad ray florets and a center of disc florets; flower color is very variable between the different species. The genus includes several ornamental plants popular in gardens. Numerous hybrids and cultivars have been selected and named.

Selected species

Cosmos atrosanguineus (Hook.) Voss – Chocolate Cosmos
Cosmos bipinnatus Cav. – Garden Cosmos
Cosmos caudatus Kunth – Ulam Raja
Cosmos parviflorus (Jacq.) Pers. – Southwestern Cosmos
Cosmos scabiosoides Kunth
Cosmos sulphureus Cav. – Sulphur Cosmos

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Botanical name: Cosmos @ Old Farmer’s

Plant type: Flower

Sun exposure: Full Sun

Soil type: Loamy

Flower color: RedPinkOrangeWhite

Bloom time: SummerFall

Cosmos are annuals, grown for their showy flowers. The flowerheads may be bowl– or open cup–shaped and are atop of long stems. Cosmos are easy to grow and make good border or container plants. They make for good decorations in flower arrangements and also attract birds, bees, and butterflies to your garden.

Planting

  • If you want a head start, you can plant cosmos indoors 4 to 6 weeks before the last spring frost in trays or pots with a good seed-starting mixture. Seedlings grow fast, so move them into 5-inch pots as soon as they’re 3 or 4 inches tall.
  • Plant seeds in moist, well-drained soil about 1/4-inch deep and 12–18 inches apart after the danger of frost has passed. You can also plant transplants instead of seeds. They also like soil that is not too rich.
  • They can tolerate warm, dry weather.
  • Depending on the type of flower, cosmos can grow anywhere between 18–60 inches tall.
  • If you are growing cosmos from seeds, be mindful that it takes about 7 weeks to first bloom. After that, though, your flowers should continue to bloom until the next frost.

Care

  • In order to prolong flowering, you should deadhead the plants (remove the dead/faded flowers).
  • Because some of these plants can grow really tall, staking may be necessary.
  • Water regularly, but make sure you don’t over-water the plants. Over-watering and over-fertilization can lead to plants with fewer flowers.
  • Cosmos beds may become weedy due to the fact that they self-seed, so remember to check them.

Pests

Harvest/Storage

  • To harvest more seeds, remember to leave a few flowers on the plant because they will self-seed.
  • You can cut the flowers off anytime after blooming, but it’s best to pick some right when the petals have opened.
  • If you cut the blossoms on good stems when they first open, they’ll last more than a week in water.

Recommended Varieties

  • Picotee, which have pretty white flowers with a crimson border around the edge of the flower (some are also flecked in crimson)
  • Sea Shells, which have white, pink, or red tube-shaped petals

Special Features

  • Attracts Butterflies
  • Attracts Birds

1280px-Cosmos_na_Mostra_de_Flor_de_Hong_Kong

 

 

 

 

 
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