Growing & Maintenance Tips for Achillea ptarmica 'Marshmallow'

To care for Achillea ptarmica Marshmallow, ensure it receives full sun to partial shade and well-drained soil. Water the plant regularly but allow the soil to dry out between waterings to prevent root rot. Prune spent flowers to encourage new blooms and maintain its bushy shape. Fertilize sparingly, as this plant thrives in less nutrient-rich conditions.