Choose a site with full sun to partial shade and moisture-retentive, slightly acidic to neutral soil with good drainage, spacing plants approximately 60-90cm (2-3ft) apart to allow for their spreading rhizomatous nature.
Water consistently during establishment, particularly during dry periods, but avoid waterlogging. These robust perennials appreciate a layer of organic mulch around their base to retain moisture and suppress weedy competition.
While generally disease-resistant, monitor for potential issues like powdery mildew in humid conditions. When deadheading, cut spent flower spikes back to the first set of healthy leaves to promote continuous blooming and prevent excessive self-seeding.
During autumn maintenance, cut stems to ground level after the first hard frost, leaving a small stubble to highlight the crown. Every 3-4 years, divide mature clumps in early spring or autumn to reinvigorate the plant, ensuring each division contains healthy roots and shoots, which will help maintain vigour and prevent overcrowding.