|'Dartmoor' has red to purple flowers in less common open-branched panicles. Spreading deciduous shrub grown for its long clusters of fragrant flowers throughout the summer. Graceful, arching branches bear slender leaves that are deeply cut. Reaches up to 10 feet tall and about 15 feet wide. Ideal for attracting butterflies. Combines well with other perennials, especially daylilies and shasta daisies. This is one plant that thrives on severe pruning.