IPM1007, Revised November 2009
Winter annual broadleaf
Usually a winter annual but occasionally a summer annual weed that forms dense, prostrate mats. Knawel is commonly mistaken for a grass and is primarily a weed of lawns, turfgrass and small grains. Seedlings have cotyledons that are linear in outline and less than 1 mm wide with a sharp tip. Mature plants also have the same kind of leaf structure. Leaves are arranged oppositely along the stem and joined by a thin, clear membrane. Stems grow prostrate along the ground, are branching, and form dense mats outward from a central plant. Flowers are inconspicuous, green and spiny.
IPM1007, revised November 2009
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