Cosmos atrosanguineus is a herbaceous perennial plant growing to 40–60 cm tall, with a fleshy tuberous root. The leaves are 7–15 cm long, pinnate, with leaflets 2–5 cm long. The flowers are produced in a capitulum 3-4.5 cm diameter, dark red to maroon-dark brown, with a ring of six to ten (usually eight) broad ray florets and a centre of disc florets typical of the Asteraceae family.
The flowers have a light vanillin fragrance (like many chocolates), which becomes more noticeable as the summer day wears on.
The single surviving clone is a popular ornamental plant, grown for its rich dark red-brown flowers. It is not self-fertile, so no viable seeds are produced, and the plant has to be propagated by division of the tubers, or by tissue culture. It requires partial sun or full sun, and flowers from mid- to late summer. It is frost-sensitive (Zones 6-11); in temperate zones, the tuber has to be dug up and stored in a frost-free store over the winter.
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I appreciate your linking up and enjoy personally seeing your great photos, however, due to a work-related busy time I may have not commented lately - I shall endeavour to do so ASAP!