Hands down, our test garden's most handsome plant: tall, dark green stems; bright sage green leaves; abundant 1 1/2" florets of the richest blue with truly black sepals just below the petals. Not only are they gorgeous, but they bloom relentlessly from late spring to early autumn. The tall, graceful plants, 4 ft. x 3 ft. work beautifully in large pots, but stunningly as borders or hedges.