White Fleece Flower plant

White Fleece Flower

Persicaria polymorpha

Updated Mar 31, 2026

White Fleece Flower (Persicaria polymorpha), also known as Giant Fleece Flower, is a tall clump-forming perennial with creamy-white summer plumes that grows best in sun and reasonably moist, well-draining soil.

About White Fleece Flower

White Fleece Flower is a large clump-forming perennial grown for its tall leafy stems and long-lasting creamy-white flower plumes in summer. It brings strong height and volume to a planting without reading as heavy.

It works especially well at the back of large borders, in naturalistic planting, and as a seasonal screen where you want both structure and softness. The flowers also attract pollinators, and the seed heads can remain visually useful after bloom.

White Fleece Flower is bold in scale but generally well-behaved, expanding as a clump rather than spreading aggressively. It performs best when given enough room and reasonably moist soil.

How to Care for White Fleece Flower

Watering

Water White Fleece Flower regularly during the first growing season so the roots can establish well enough to support its fast summer growth.

After establishment, keep a steady but not soggy pattern. Deep watering when the top layer begins to dry is better than frequent light watering. If the leaves lose their crisp look or the plant seems to slow in midseason, it often needs more consistent moisture.

A light mulch can help keep the root zone more even.

Sunlight

Grow White Fleece Flower in full sun for the strongest stems and the fullest flower display.

It can also tolerate partial shade, especially where summers are hot, but too much shade usually reduces flowering and makes the plant looser in shape. If growth is healthy but bloom is poor, increasing light is usually more useful than adding extra fertilizer.

Temperature

White Fleece Flower is comfortable in cool to moderate climates and handles winter cold well where it is considered hardy.

During summer, the main stress comes from heat combined with drought. In warmer regions, afternoon shade and steady soil moisture help keep the foliage fresher for longer.

Humidity

Average outdoor humidity is usually suitable for White Fleece Flower. It does not need especially dry or especially humid air.

What matters more is avoiding stagnant air around dense wet foliage. Normal spacing and airflow between stems help keep the planting cleaner and reduce minor leaf problems.

Soil

Plant White Fleece Flower in well-draining soil that still holds enough moisture to support strong summer growth. The best balance is moist, not waterlogged soil.

A loam improved with compost works well because it helps retain even moisture while still keeping air around the roots. Heavy clay can also work if it is improved or if the plant is set slightly raised so water does not sit around the crown too long.

Pruning & Grooming

Cut White Fleece Flower back hard in late winter or early spring before new shoots begin. It regrows reliably from the base.

After flowering, you can lightly deadhead or trim if the seed heads no longer suit the planting, though many gardeners leave them for texture. In colder climates, avoid heavy pruning late in the season so the plant can settle into dormancy naturally.