Carried by 0 nurseries
View Availability at NurseryData provided by the participants of the Consortium of California Herbaria
View additional distribution information on the Jepson eflora
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
Butterflies and moths supported
0 confirmed and 34 likely
Garden Webworm Moth
Achyra rantalis
Civil Rustic
Caradrina montana
Guenée's Carpet Moth
Ceratodalia gueneata
Spotted Fireworm Moth
Choristoneura parallela