Hardy, summer-bloomer with spectacular purple flower spikes. It has an arching, spreading habit and typically grows 5-10' tall and 4-6' wide.
The 'Windy Hill' variety averages at 5' tall and wide and produces fragrant purple flowers that bloom from mid-summer into fall. It has a spreading growth habit and is known for having strong, upright stems. Cold hardy, withstanding zones 5-8.
