Spotted Knotweed

(Persicaria strigosa)

Spotted Knotweed (Persicaria strigosa)

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Climate Requirements

Precipitation 42" - 71"
High Temp. 78°F - 86°F
Low Temp. 44°F - 52°F

Summary

Persicaria strigosa, commonly known as Spotted Knotweed, is a deciduous herbaceous plant native to Africa, Asia and Australia. It is typically found in primarily found in seasonally dry tropical biomes. Persicaria strigosa grows to a typical height of 20-60 cm, with a spreading habit that can cover a significant area if left unchecked. The plant features lance-shaped leaves and small, inconspicuous white or pinkish flowers that bloom in the summer. The flowers are not particularly showy, but they do attract pollinators such as bees and butterflies.

Spotted Knotweed is valued for its ability to stabilize soil in wet areas and is sometimes used for erosion control. It is also appreciated for its lush green foliage in garden settings, where it can serve as a ground cover in shady spots. Gardeners should plant it in moist, well-drained soil with consistent moisture, and it can tolerate a range of soil types. While it prefers part shade or full shade, it is adaptable to various light conditions. There are no widely recognized cultivars of this species in the horticultural trade. Potential problems include susceptibility to leaf spot diseases and the possibility of it becoming overly aggressive in ideal conditions, potentially crowding out other plants.CC BY-SA 4.0

Plant Description

  • Plant Type: Herb
  • Height: 1-2 feet
  • Width: 2-3 feet
  • Growth Rate: Moderate
  • Flower Color: Pink, White
  • Flowering Season: Summer
  • Leaf Retention: Deciduous

Growth Requirements

  • Sun: Part Shade, Full Shade
  • Drainage: Medium

Common Uses

Erosion Control, Low Maintenance

Natural Habitat

Primarily found in seasonally dry tropical biomes in Africa, Asia and Australia

Other Names

Common Names: Strigose Knotweed

Scientific Names: Persicaria strigosa, Persicaria strigosa, Persicaria subsagittata, Polygonum arifolium, Polygonum auriculatum, Polygonum bodinieri, Polygonum hispidulum, Polygonum horridum, Polygonum horridum, Polygonum muricatum

GBIF Accepted Name: Persicaria strigosa