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View Availability at NurseryData provided by the participants of the Consortium of California Herbaria
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Swamp Knotweed (Polygonum amphibium) is a common native perennial herb in the Polygonaceae (Buckwheat) family that grows throughout California in almost every county. It is a wetland plant that is moderately fast growing and moderately long-lived. It grows in a rounded form to a height of 0.1 foot, with active growth during the summer. Flowers are yellow and bloom in the late spring. Leaves are medium green and deciduous. It tends to grow in shallow lakes and streams, at elevations from 0-10000 feet.
Perennial herb
8 - 48 in Tall
Winter Deciduous
Yellow
Water features or wet habitats
Partial Shade
1*, 2*, 3*, 4*, 5*, 6*, 7*, 8*, 9*, 14*, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Shallow lakes, streams, shores
Chaparral, Foothill Woodland, Lodgepole Forest, Red Fir Forest, Subalpine Forest, Valley Grassland, Yellow Pine Forest, Wetland-Riparian
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Likely
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Confirmed
Yellow-faced Bumble Bee
Bombus vosnesenskii
Shifty Miner Bee
Andrena saccata
Urban Digger Bee
Anthophora urbana
Common Sickleleg
Asemosyrphus polygrammus
Chicory
Cichorium intybus
Buckwheat
Fagopyrum esculentum
Strawberries
Fragaria
Lettuce
Lactuca sativa