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Cosmos atrosanguineus



  • Common Name: Chocolate cosmos, Black cosmos, Black dahlia
  • Synonyms: Bidens atrosanguinea, Cosmos atrosanguineus 'Chocolate', Cosmos diversifolius atrosanguineus
  • Position: Full sun, East-facing, South-facing, West-facing, Exposed, Sheltered
  • Soil: Moist but well-drained, Chalk, Loam, Sand, Acid, Alkaline, Neutral
  • Flowers: Summer
  • Flower Colour: Red
  • Hardiness: H3 - Hardy in coastal and relatively mild parts of the UK
  • Habit: Deciduous, Branched, Spreading
  • Height & Spread: 60cm × 45cm
A spreading perennial with divided leaves and chocolate-scented maroon flowers in summer.
Please Note: Container-grown Cosmos can naturally be very floppy in habit. This is nothing to be concerned about when you receive your plant. Once in the ground, they become a much more stable plant. Please do not be worried if some of the outer stems become detatched in transit. This will have no detrimental effect on the future performance of the plant.
Cosmos atrosanguineus RHS Chelsea Flower Show