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botanical name:
Cosmos atrosanguineus
Cosmos atrosanguineus © Deeproot Plant Base
synonyms:  Bidens atrosanguinea
family:  Asteraceae
characteristics: annual/biennial, scented/aromatic
height: 0.75m
width: 0.45m
growth rate: medium
growth habit: erect
leaf colour: dark green
flower colour: maroon
stem/bark: brown
main season: Summer
aspect: full sun
conditions: dry soil, moist soil
preferred soil pH: any
minimum temp: -2°C
USDA zone: 8 to 11
Erect and then spreading, tuberous perennial with reddish-brown stems and pinnate leaves, Solitary, shallowly cup-shaped, dark maroon flowers with a velvety texture and distinct, strong chocolate scent, from midsummer to autumn..

Well drained soil in full sun. Not very hardy and difficult to overwinter. In cold areas it is best to lift the tubers in autumn and store frost free over winter in just slightly damp compost.

From seed.

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