Cosmos Species, Black Cosmos, Chocolate Cosmos
Cosmosatrosanguineus

Synonym:Bidens atrosanguinea

Synonym:Cosmos diversifolius var. atrosanguineus

Category
Perennials
Tropicals and Tender Perennials

Water Requirements
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings

Sun Exposure
Full Sun

Foliage
Evergreen

Foliage Color

Height
18-24 in. (45-60 cm)

Spacing
24-36 in. (60-90 cm)

Hardiness
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)

Where to Grow

Danger
N/A

Bloom Color
Maroon/Burgundy

Bloom Characteristics
Flowers are fragrant

Bloom Size

Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall
Late Fall/Early Winter

Other details

Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information
Non-patented

Propagation Methods
By dividing the rootball

Seed Collecting
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed