|Fast growing, upright, compact perennial, although usually treated as an annual. Leaves are whitish gray to medium green, shiny, lance shaped and 3" long. 'Rhea' has long lasting, very deep blue, narrow flower spikes, to 14" tall. Outstanding in mass plantings, borders or containers. Thrives in full sun in well drained soil. A welcomed blue addition that blends or complements just about any color in the border. Native to Texas and Mexico.