Cosmos atrosanguineus Black Magic

Cosmos atrosanguineus ‘Black Magic’ | Chocolate Cosmos Seeds

Discover one of the darkest and most captivating flowers you can grow. Cosmos atrosanguineus ‘Black Magic’, also known as Chocolate Cosmos, produces luxurious velvety blooms in an intense deep burgundy-black shade that almost appears black in the garden.

The elegant flowers sway on long, slender stems above delicate foliage, making them a favourite for romantic cottage gardens, naturalistic plantings and premium cut flower bouquets. On warm summer days, the flowers may release a light chocolate-like fragrance, adding another layer of charm to this extraordinary variety.

Perfect for flower farmers, gardeners and floral designers looking for dramatic contrast and sophisticated colour palettes.

Why you’ll love it

• Rare deep burgundy-black flowers
• Elegant long stems for cutting
• Excellent for bouquets and floral arrangements
• Flowers continuously from summer until frost
• Attractive to bees and pollinators
• Perfect for borders, cutting gardens and containers

Growing information

Botanical name: Cosmos atrosanguineus
Common name: Chocolate Cosmos
Plant type: Tender perennial (grown as an annual in colder climates)
Height: 60–90 cm (24–36 in)
Spacing: 30–40 cm (12–16 in)
Sun: Full sun
Soil: Fertile, well-drained soil

Sowing

Sow indoors 6–8 weeks before the last frost.

• Germination: 10–21 days
• Ideal temperature: 20–22°C (68–72°F)
• Cover seeds lightly with vermiculite or fine soil, as they benefit from slight darkness during germination.
• Transplant outdoors only after all danger of frost has passed.

Care

Provide regular watering during dry periods and remove spent flowers to encourage continuous blooming. Support may be beneficial in windy locations.

Flowering period

July–October

Perfect for

• Cut flower gardens
• Luxury bouquets
• Cottage gardens
• Pollinator gardens
• Borders
• Containers