It looks like Knot grass from the picture oh are you in for fun.
Knotgrass is an annual weed troublesome among cereals, sugar beet, root crops and on most arable soils. It is found throughout Britain and is said to grown at an altitude of even up to 1,800 ft.It is common in the vegetation cover and in the soil seedbank.It is located throughout the southeast United States, Arkansas, Texas, Oklahoma, and in the western United States. It is native to Louisiana.
Habitat
It prefers a habitat of light sandy soils and soils manured by sheep. It occurs on roadsides, waste ground, gardens and near field margins. It occurs in soils deficient in lime. While it is a plant of disturbed and trampled habitats, in urban situations it occurs in less trampled, paved areas.