Black Cosmea (Cosmos atrosanguineus).

Black Cosmos (Cosmos atrosanguineus): This rare, extraordinarily beautiful flower has a unique feature that will leave you speechless: a fantastic, intense, and unmistakable chocolate scent. Native to Mexico, it was thought to be extinct. We won't lie to you: it's not easy to grow, requiring attention and expert hands from germination onward; it's not suitable for beginners. The plant is smaller than traditional cosmos and blooms less often, but the flower is one of the most beautiful of the species. If you want to propagate from seeds, we recommend growing it in a pot to keep it visible. It will provide you with plenty of seeds that you can use for later cultivation in the ground.
As rare as it is beautiful.