Dallisgrass (Paspalum Dilitatum) What does it look like?: Commonly mistaken for Crabgrass, Dallisgrass produces round patches of messy mounding leaves and tall stalks which can grow almost 18 in. tall. The stalks produces spikes which house hundreds of black seeds that can be spread by wind, animals, or a lawnmower. What causes it?: This guy can grow