Chocolate Cosmos (Cosmos atrosanguineus): The Scented Dark Flower

Cosmos atrosanguineus, the Chocolate Cosmos, is a unique, tuberous-rooted perennial celebrated for its velvety, deep maroon-to-chocolate-brown flowers that exude a distinct chocolate-vanilla fragrance, especially on warm days. It's a sensory delight in the garden.

Botanical Profile

Culture & Allure

Native to Mexico (now extinct in the wild), this cosmos grows 18–30 inches tall with ferny, pinnate foliage. The 1.5–2 inch flowers bloom from summer to fall on wiry stems. The chocolate scent is strongest in late afternoon. It requires full sun, well-drained soil, and moderate water. The tuberous roots allow it to survive drought.

Hardy only to about 20°F (-7°C) with heavy mulch; in zones 7–10, it may overwinter. In colder zones, lift tubers after frost and store like dahlias, or grow as an annual. Propagate by division or seed (though seed may not come true). A captivating, fragrant addition to borders, cottage gardens, and cut-flower arrangements. A true chocolate lover's flower.