Cosmos atrosanguineus - 2026

Cosmos atrosanguineus, commonly known as the chocolate cosmos, is a striking tuberous perennial admired for its rich, velvety, deep red to almost black flowers, which exude a distinctive chocolate fragrance. Blooming over a long period from midsummer to early autumn, the flowers stand out against dark green, divided foliage, creating an elegant and dramatic display. Highly attractive to bees and butterflies, it adds both ornamental beauty and ecological value to borders, containers, and cut-flower gardens.

Preferring full sun and fertile, well-drained soil, Cosmos atrosanguineus thrives in warm, sheltered spots. Although tender and not fully hardy in the UK, the tubers can be lifted and stored over winter or grown in containers that can be overwintered indoors. With its unique fragrance, prolonged flowering season, and striking flower colour, it is a captivating choice for adding late-summer interest and an exotic touch to garden displays.