Dark red-brown, sometimes almost black, velvety flowers on long, slender, reddish brown stems bloom from early summer to autumn. Chocolate cosmos is a tuberous-rooted, tender perennial native to Mexico that can be overwintered indoors where not hardy.

What month do cosmos flowers bloom?

Cosmos usually starts blooming in early summer and continues until frost if you deadhead. While you don't have to deadhead, doing so keeps the planty looking tidy and encourages a quick rebloom.

Why is my chocolate cosmos not flowering?

Cosmos do not bloom if they are in too much shade, consistently boggy soil, or with too much nitrogen fertilizer. Cosmos require well draining low nutrient soil with lots of sun and not too much watering. If the day length is more then 14 hours then cosmos cannot display flowers.