Fig. 1. Relationship of mowing height to cover of crabgrasses [smooth crabgrass (Digitaria ischaemum) or not specified (Digitaria spp.)] in cool-season turfgrasses. Species of turfgrass is Kentucky bluegrass (KB, Poa pratensis), Chewings fescue (CF, Festuca rubra subsp. fallax), or tall fescue (TF, F. arundinacea).