Chocolate lovers, here's a flower for you! Chocolate cosmos (cosmos astrosanguineum) are known for their unique reddish brown flowers that have a light vanilla fragrance, like many chocolate candies. Even though the smell is intriguing, don't be tempted to taste the poisonous blossom.
Native to Mexico, chocolate cosmos are an herbaceous perennial in warmer climates, and an annual in colder climates. They grow from 1 to 3 feet tall(30 to 91 centimeters), and enjoy full sun to partial shade. Gardeners recommend clustering six to eight plants together to enjoy the full effect of the fragrance, which becomes stronger as summer days heat up [source: Ferguson].