An utter joy of a plant to complement a wilder planting.  Smothered in lemony flowers for many months over the summer July to September. Loves full sun and deals well with semi shade.  A must have plant for its abundant flowering, can self seed when happy.  Scatter these plants through your border, the best border position is front or middle.  
 
This is a hardy perennial meaning it will die back in Winter but will survive any winter conditions and return the following years.   Allow to die back naturally if self seeding is welcome.