|Grown for its profuse blooms in deep lilac to purple. Low-growing and strongly branched, this deciduous shrub is grown for its long clusters of up to 1 foot panicles of fragrant flowers throughout the summer. Reaches up to 6 feet tall. Ideal for attracting butterflies. Combines well with other perennials, especially daylilies and shasta daisies. This is one plant that thrives on severe pruning.