This superstar plant tops out by summer’s end at 5-6′ tall, with prolific clusters of beautiful blue flowers for the back of the border. Just as the summer garden winds down, this beauty gives you a jolt of autumn color. Fantastic planted with other fall bloomers like fountain grasses and goldenrod. Butterflies love her and she makes a great cut flower. Half to full sun for best blooms. Completely drought-proof once established.