Knotweed is a shrubby clump-forming perennial with lace-shaped dark green foliage. Tall panicles of creamy-white flower plums resembling goats-beard bloom through summer and fade to tan in early fall. Best flowering in full sun and moist, well-drained soils. Drought and humidity tolerant once established.
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Type: |
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Height: |
3' - 5' |
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Spread: |
3’ - 4’ |
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Spacing: |
3.5’ |
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USDA Hardiness Zone: |
4 - 9 |
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Culture: |
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Bloom Color: |
White |
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Season of Interest: |
MAINTENANCE NEEDS: Low Maintenance. Water regularly. No serious pests or diseases. Less aggressive spreader than many other Persicaria species.
LANDSCAPE USES: Accents or Group Plantings, Borders, Naturalized Areas, Rock Gardens, and Containers.
COMPANION PLANTS: Rose, Little Bluestem, Rudbeckia
IMAGE: Acabashi, 'Persicaria polymorpha' Giant fleeceflower in the West Garden, Hatfield House, Hertfordshire, England, CC BY-SA 4.0
