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A highly attractive, clump-forming, rhizomatous, herbaceous perennial with upright, strap-like, green leaves and erect stems bearing large, ruffled flowers with pale yellow upper petals, known as standards, and veined, dark yellow lower petals, known as falls, in late spring and early summer
Grow in any moist but not waterlogged, neutral to slightly acidic soil in full sun or partial shade. Plant in late summer or early autumn. In drier soils, dig in well-rotted manure before planting and apply as a mulch each spring