A chocolate cosmos
A little background:
Cosmos atrosanguineus is a perennial member of the Asteraceae family, native to Central America, but has not been wild since the species was introduced into cultivation in 1902. Since then it has come down to us through vegetative propagation (basal cuttings taken in late summer or in-vitro culture).
In 2005, the German seed company, Jelitto, received a single inflorescence of Cosmos atrosanguineus from a private garden in New Zealand. In 2016 Jelitto brought out a horticultural innovation with the first sexually reproduced Cosmos atrosanguineus!
So, in the spring of 2016, with great care and excitement, we produced our first Cosmos atrosanguineus 'Black Magic' from seed.
This is an unprecedented event in the history of horticulture!
Cosmos atrosanguineus 'Black Magic' grows into an upright clump, 40 centimetres in height. The flowering starts in June and lasts until October. Single flowers, three to four centimetres in diameter, that look something like a simple dahlia, with a ruby to dark maroon colouring, appear at the end of the season.
A scent of vanilla with chocolate hints in the warmth of summer.
In the garden, we like to plant this cosmos in warm or exotic colour combinations on the edge of a border with Kniphofia, Crocosmia, Salvia microphylla, dahlias or for a simple contrast, with a silvery-leaved artemisia.
We also like to grow it in pots on a patio to get the most of its delicious aroma.
Grow in the sun or slight shade in fertile, sandy soil that is moist and slightly acid to alkaline.
Although cosmos is hardy in temperate zones (seaside), it is grown the same way as dahlias; you need to lift the roots at the end of the autumn and overwinter in a dry bed of compost, garden soil or barely moist peat. Late planting in April-May after the first warmth of spring.
Synonym: Bidens atrosanguinea 'Black Magic'
- 12 cm pot
- Hardiness zones : zone 9-10
- Height: 50 to 70cm
- Plant spacing: 40 cm
- Flower colour: ruby
- Flowering period: summer flowers