How to Prune bergamot 'Blaustrumpf'?
Deadheading regularly may prolong flowering; cut back to ground level in autumn

bergamot 'Blaustrumpf' · Monarda 'Blaustrumpf'
Grow in moderately fertile, humus-rich, moist but well-drained soil in full sun or partial shade. Protect from excessive winter wet and do not allow to dry out in summer. Lift and divide every three years.
Deadheading regularly may prolong flowering; cut back to ground level in autumn