Lambsquarter is an erect summer annual. The leaves of lambsquarter are lanceolate in shape, approximately 1-2 inches in length and about 1-inch wide. The edges of the leaf are toothed and the leaf tip is pointed. The leaves are covered with a white mealy substance, especially on the underside of the leaf. The leaves form alternately on the stems. The root of lambsquarter is a branched taproot.
The flowers of lambsquarter are found in small green clusters and lack petals. The clusters of flowers form in terminal spikes. Lambsquarter spreads by black seeds that germinate in the late spring to early summer. Lambsquarter is found throughout Canada and the United States.
Lambsquarter is usually found in low-maintenance turf situations. Proper mowing will usually control lambsquarter due to its upright growth habit. It establishes easier in spring-seeded cool-season turf that enters the summer in a thin state. Lambsquarter will grow in both acidic and alkaline soils.
Make your post-emergence herbicide application to lambsquarter that is actively growing and in the seedling to flower stage of growth.