Leonurus sibiricus 
A wonderfully easy to grow, flowering medicinal herb.  
This plant grows up to 2m, approx. 50cm wide and is covered with pink/purple flowers much loved by native bees and other beneficial insects.
Prefers a rich, moist, well-drained soil and is very tolerant of poor, dry soils.  
This plant will self sow readily if left to go to seed.