Davis' Knotweed
Polygonum davisiae W.H. Brewer ex A. Gray - Buckwheat family
Size
Mature Height: Up to around 16 inches
Planting Distance: 4.0 feet
Plant Type: Subshrub, Forb/herb
Root Depth: 14 inches
Growth Form: Single Crown
Growth Rate: Moderate
Features
Flower Color: Purple
Conspicuous Flowers: Yes
Bloom Time: Early Summer
Seasonal Growth: Spring and Summer
Evergreen: No
Fall Colors: No
Conditions
Shade Tolerance: Intermediate
Clay Soil Tolerance: No
Sandy Soil Tolerance: Yes
Drought Tolerance: Medium
Flood Tolerance: None
Salt Tolerance: None
Ecosystem Interactions
Pollinators: Larval Host (Moth)
Larval Species depending on Davis' Knotweed: Synanthedon chrysidipennis
Native Range
- USA: California, Idaho, Oregon, Washington
State-level native status is based on data available through Plants of the World Online. Regional Native Status comes from the USDA Plants Database. For more detailed native status information, please refer to BONAP.