Crabgrass is a common weed that almost everyone knows. (The "great philosopher" Pogo said, "Work is the crabgrass in life.") There are two species of crabgrass common in California: smooth crabgrass, Digitaria ischaemum, and large or hairy crabgrass, D. sanguinalis. Crabgrass is found in turfgrasses (mostly smooth crabgrass) and in ornamental landscapes (primarily large crabgrass). Large crabgrass is also found in orchards, vineyards, and other agricultural areas. Crabgrass also has many other names including crowfoot grass and summer grass.
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