Description Prostrate knotweed (Polygonum aviculare) is a low-growing summer annual or perennial which is very competitive in compacted soils. The alternate leaves are up to 1" long and 1/3" (8mm.)across. Prostrate knotweed is a supreme indicator weed. Prostrate knotweed can be casually confused with spotted (prostrate) spurge or common purslane. Prostrate Knotweed (Polygonum aviculare) ProstrateKnotweed. A resource guide from the Dept. An easy way to tell prostrate knotweed from spotted spurge is to break a stem. mature plants showing prostrate growth habit. Knotweed family (Polygonaceae) Description:Thisplant is a more or less prostrate summer annual, producing hairlessstems up to 3' long. Polygonum aviculare or common knotgrass is a plant related to buckwheat and dock. Sixty-one species of insects have been observed feeding on prostrate knotweed (Wilson et al. Prostrate knotweed, a common weed in the Polygonaceae family, is not addressed in this document. Knotweed is the earliest germinating of all the summer annual weeds. The herb’s earlier use as a treatment for tuberculosis has now only historical interest. It rarely reaches more than a few inches tall. prostrate knotweed. Even though knotweed does not root down at the nodes of the stems, a single plant can form a dense mass up to three feet across. Prostrate knotweed is commonly associated with soil compaction and can be seen in gravel roadbeds, sidewalk edges, crevices, paths and other high-traffic areas (like in front of soccer goals). It grows in fields and wetlands both in high and low elevations throughout the world and in all 50 states of the USA. Prostrate knotweed tolerates extremely compacted soils and … KNOTWEEDS. They are oblong or oblong-elliptic, smooth along the margins,and hairless. Prostrate knotweed provides a habitat and food source for many farmland birds and mammals (Firbanks and 002, Watson et al. Oval, bluish-green leaves, 1 inch long and 1/4 inch wide, are attached to the stems at prominent joints. Prostrate knotweed is often confused with first-leaf crabgrass. Purslane also has red stems. Prostrate knotweed is very similar to erect knotweed. It is an annual found in fields and wasteland, with white flowers from June to October. Polygonaceae (Smartweed Family) seedling. The stem is smooth with swollen joints, light purplish red in color, slender branches and are called as nine joints. Prostrate knotweed is probably the earliest of the summer annuals to germinate in the spring. Flowers form in late spring. Prostrate knotweed tolerates extremely compacted soils and … vegetum . Also called knotgrass or doorweed, this annual weed grows in areas with compacted, infertile soil, such as driveways, dirt walkways, and recreation areas where the soil and grass are heavily trampled. interactions: Prostrate knotweed is capable of colonizing disturbed ground and creating dense layers. Thank you! They differ primarily by leaf shape. Plants branch extensively at the base, with branches lying along the ground but not rooting. Prostrate knotweed leaves are relatively narrow and long (left). Prostrate Spurge (Euphorbia maculate) Interesting Information About Plant: The Euphorbia maculata (spotted spurge) is a plant native to North America.The Prostrate Spurge, also commonly known as creeping spurge or spotted spurge, typically grows in the side walk cracks next to … Prostrate knotweed is a summer annual weed related to buckwheat and dock originally from Eurasia. Cotyledons are linear in outline and are often misidentified as a grass seedling. It is found throughout California up to 8200 feet (2500 m). The slender stems radiate from a central taproot and produce a tough mat-like growth. 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