Threadleaf coreopsis forms a loose cushion of highly dissected 2- to 3-inch leaves and grows 2 to 3 feet tall. It is a wonderful plant for a flower border. Single, yellow, daisy-like flowers, 1-1/2 to 2 inches in diameter, are profuse during the summer. Deadhead for an additional autumn burst of color. The threadleaf coreopsis is an easy-to-grow, sun-loving perennial that provides a very fine texture in your garden.