A rossette-forming, rhizomatous perennial. Plants create a low mound or rosette of finely-cut, fernlike leaves, bearing upright stems of creamy-white flowers in early summer. This species is much more tolerant of average to dry soils than most other forms. Flowering period May-June. Height 40-50cm. Spread 30-45cm. Plant requires full sun to partial shade in moist but well drained, neutral to alkaline soil.