For example, prostrate knotweed grows and thrives in hard, compacted soils. Overview Information Knotweed is an herb. The whole flowering plant is used to make medicine. in Ontario are dandelion, plantain, black medick, chickweed, prostrate knotweed, mallow, henbit, ground ivy and white clover. However, one NIGHTMARE weed that should be mentioned is the Prostrate Knotweed. Common knotweed can thrive even on poor and compacted soil and inhabits agricultural land, … It is awful and even worse to get rid of. In northeastern Ohio, prostrate knotweed was not present in the extant vegetation but occurred in the soil seed bank (2,631.6 seeds/m²) of a highly saline saltpan [ 51 ]. Ottawa, Ontario K1A 0C6, Canada Awarded the George Lawson Medal by the Canadian Botanical Association in 2006. The stem is smooth with swollen joints, light purplish red in color, slender branches and are called as nine joints. These It is one of the most common weeds along roadsides, edges of or cracks in sidewalks and pavement, and heavy-traffic areas in lawns. Prostrate knotweed occurs throughout Ontario in areas of moderately heavy foot- or wheel-traffic where the soils may be low in fertility and so heavily compacted that other plants are unable to survive. The growth habit of this species is low to the ground, hence the name prostrate knotweed. Herbicides are only one of the many tools that can be used to control weeds in turf. Prostrate knotweed is an effective ayurvedic shrub that is used in the treatment of many disorders. Common knotweed (prostrate knotweed) is a short-lived perennial broadleaf plant that sometimes lives as an erect annual. The major grassy weeds are crabgrass, annual bluegrass, quackgrass, orchard grass and bentgrass. Other weeds indicate your lawn is too wet, shady, infertile or thin. Prostrate knotweed is a summer annual that is generally found on hard compacted soils or damaged areas. Its leaves are small, lance or oval-shaped, torn, white shining, red at the base and are two-lobed. Due to its early germination timing, knotweed is able to claim resources and invade damaged areas before other desirable grasses begin to grow. The leaves are alternately arranged on stems, small (½ to 1 inch long by ¼ to ½ inch wide), and blue green, and have margins that are not serrated or lobed. Great article on Weeds...and comments. Seeds of prostrate knotweed were found at a low density (4.3 seeds/m²) in the seed bank of a forested woodlot in southern Ontario . Submitted by Chris on August 14, 2019 - 11:36pm. This species is often seen emerging through cracks in sidewalks and parking lots and is usually not too much of a problem in agronomic crops. Identifying weeds and understanding how they grow will help you correct any problems with your lawn that encourage weed invasion. 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