Alphabetical Plant Listing

Cosmos atrosanguineus (Chocolate Cosmos)

Chocolate Cosmos, Black Cosmos, Black Dahlia, Chocolate Plant, Bidens atrosanguinea, Cosmos atrosanguineus 'Chocolate'


Highly sought after, Cosmos atrosanguineus (Chocolate Cosmos) is a tuberous perennial boasting chocolate-scented, velvety deep crimson flowers, up to 2 in. across (5 cm), from midsummer to fall. Its pinnately divided leaves are often lobed at the base and are attached to the stems by winged petioles. Fairly pest-free and low maintenance, add this charming and graceful plant to the landscape and you will be rewarded with scores of hummingbirds and butterflies. This profuse bloomer creates a striking visual impact in the garden and looks particularly outstanding when combined with ornamental grasses such as Agrostis nebulosa or Stipa tenuissima. It is also is a wonderful plant to have in containers where its fragrance can be enjoyed.

  • Grows up to 24-30 in. tall (60-75 cm) high and 18 in. wide (45 cm).
  • Performs best in full sun, in moderately fertile, medium moisture, well-drained soils. Dry soils are tolerated. This plant is fairly drought tolerant. Mulch in fall.
  • Deer and rabbit resistant
  • Ideal addition to beds and borders, containers, cottage gardens and cutting gardens.
  • Always remove the spent flowers promptly for continued blooms.
  • Propagate by taking basal cuttings in early spring and providing bottom heat.
  • If you have doubts about the plant's survival over winter, you may dig the tuber, once the foliage has died back. Cut the stems back to within 2 inches (5 cm) of the tubers, and store them in slightly moist peat moss in a frost free place.
  • Native to Mexico.

Not sure which Cosmos to pick?
Compare All Cosmos

Buy Cosmos atrosanguineus (Chocolate Cosmos)

Requirements

Hardiness 7 – 10
Heat Zones 1 – 11
Climate Zones 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Cosmos
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" (45cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Fragrant, Showy
Tolerance Deer, Drought, Rabbit, Dry Soil
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Patio and Containers
Garden Styles City and Courtyard, Cutting Garden, Informal and Cottage

Buy Plants

Great Plant Combination Ideas with Cosmos

Guides with Cosmos


Botanik Foto

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 7 – 10
Heat Zones 1 – 11
Climate Zones 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Perennials
Plant Family Cosmos
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 2' – 3' (60cm – 90cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" (45cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Fragrant, Showy
Tolerance Deer, Drought, Rabbit, Dry Soil
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Patio and Containers
Garden Styles City and Courtyard, Cutting Garden, Informal and Cottage

Great Plant Combination Ideas with Cosmos

Guides with Cosmos

Plant Calculator

How many Cosmos atrosanguineus (Chocolate Cosmos) do I need for my garden?

%
ft
ft

Your Shopping List

Plant Quantity
Cosmos atrosanguineus (Chocolate Cosmos)

Find your Hardiness Zone

Find your Climate Zone

Find your Heat Zone

Join Gardenia.net

Create a membership account to save your garden designs and to view them on any device.

Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

Join now and start creating your dream garden!

Create a New Collection

Optional. For your reference.


Move Selected Plants to a Different Collection


Delete Collection

This field is required.