Very attractive in a border, cut back old flower stems at the base to encourage more blooms. Also divide and replant yearly to maximise growth and size and quantity of flower. Similar to comfrey, if you layer leaves through the compost heap, it will increase the breakdown of your garden waste.
Hardiness: Hardy
Height: 1m 
Spread: 60cm
Soil type: Well drained 
Aspect: Full sun 
Flower colour: Lilac 
Flowering time: Summer