Do you enjoy big flowers with bright, showy colors and carefree maintenance? It’s hard to beat annuals for season-long impact. Whenever I think of annuals, I immediately think of cosmos, one of the very best annuals for Colorado gardens.

There are currently thought to be 36 species in the genus Cosmos, but the two most often grown in our gardens are C. bipinnatus (left) and C. sulphureus. (There are two other Cosmos species in cultivation. One is a frost-tender, tuberous perennial known as Chocolate Cosmos, C. atrosanguineus. The other is Cosmos parviflorus, a wildflower of the western United States.)

(more…)