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A picture of a Chocolate Cosmos

Chocolate Cosmos

Cosmos atrosanguineus

Also known as

Black Cosmos, Black Dahlia, Chocolate plant

Schokoladen-Kosmee (Cosmos atrosanguineus) 7238 by Hedwig Storch (CC BY-SA 3.0)

Full Sun
Moderate care
Light watering


RHS hardiness


Minimum temperature

Expected size








3 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has a mild fragrance

More images of Chocolate Cosmos

A photo of Chocolate Cosmos
A photo of Chocolate Cosmos
A photo of Chocolate Cosmos
A photo of Chocolate Cosmos
A photo of Chocolate Cosmos

Chocolate Cosmos Overview

Cosmos atrosanguineus is a perennial species that is often grown as an annual. It has simple, slim, pinnate leaves and dark red-purple flowers which are scented with chocolate and vanilla notes, hence the common name Chocolate Cosmos. The flowers appear in late summer and this species is deciduous in its habit. It has a spreading, branching habit and is half hardy, plant in a position of full sun, in moist, well-draining soil for optimal growth. This perennial species is often grown as an annual plant due to its half-hardy nature. It doesn't cope well with temperatures below -5 degrees Celsius.

Common problems with Chocolate Cosmos

How to propagate Chocolate Cosmos


Basal cuttings are best taken in early spring, the addition of bottom heat can improve rooting.


Special features of Chocolate Cosmos

Attractive flowers

Other uses of Chocolate Cosmos

These are great for putting in your borders to bright then up during the summer.

Red Flowering Summer Plants

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