When to plant Chinese peony 'Karl Rosenfield'?

Paeonia lactiflora 'Karl Rosenfield' thrives in full sun or partial shade, though flowering is most prolific with at least six hours of direct sunlight daily. Choose a sheltered spot with good air circulation to reduce fungal disease risk. This peony performs best in loam or clay soil that is rich, moisture-retentive yet well-drained. Avoid waterlogged ground, as the roots will rot. Plant bare-root divisions between September and November while the plant is dormant. This autumn window allows roots to establish before winter. Dig a generous hole 40–50 cm wide and deep, incorporating plenty of well-rotted manure or garden compost into the base and surrounding soil. The planting depth is critical: position the crown so that the dormant buds (eyes) sit no more than 2.5–5 cm below the soil surface. Planting too deep is the most common reason peonies fail to flower. Space plants 80 cm apart to allow for their mature spread and ensure good air movement. After planting, firm the soil gently around the roots and water thoroughly to settle them in. Apply a 5 cm layer of mulch around the base, keeping it clear of the crown itself to prevent rot. Avoid disturbing the roots once planted—peonies resent being moved and can take two to three years to settle and flower reliably. If you're planting container-grown specimens in spring, take extra care not to bury the crown too deeply and water regularly through the first growing season.