Tweedia hails from Brazil, where it grows large. In northern areas it grows slowly at first, its clusters of powder-blue flowers with a watercolor wash of turquoise start to bloom by midsummer. Part of the milkweed family, and often called blue milkweed for the slim curved pods enclosing silky seeds that develop in fall. Best in a container in a sheltered sunny spot protected from rain and wind storms that will damage their delicate flowers. Nonetheless, it will continue to bloom throughout fall and can spend the winter indoors as a blooming houseplant. Provide support when setting out and pinch once to encourage branching.