Beautiful clusters of purple/lilac flowers arrive in June onwards, great at attracting butterflies, to the same level as a buddleja! Reaches 2m tall so great for adding height to your garden, and combines brilliantly with grasses.   
Type: Hardy Perennial
Height: 2m 
Spread: 5m
Soil type: Well drained 
Aspect: Full sun 
Flower colour: Purple
Flowering time: Summer into autumn