Types of Grassy Weeds


Description: This grassy weed (also called winter grass, poa annua, speargrass) is capable of growing at mowing heights lower than 1/4″. It thrives in cool, moist weather or damp, shaded locations. It produces hundreds of whitish green seed heads at any mowing height. Because of its tolerance of close mowing and seed head formation, it is particularly troublesome on golf greens.




Description: Barnyard grass is an annual grass reaching 1″ – 4″ in height. Leaves are smooth and light green in color. Length ranges from 6″ – 12″. Roots are fibrous and shallow. The flower panicles are upright and bear many branches that are green-purple in color. Seeds are tan to brown. The stem is flat and erect with roots at its nodes. The leaves are linear with a broad round base narrowing at the tip. The flower head is reddish, purplish, pinkish or greenish. The seed head is windmill-shaped and the seeds are short with stiff awns. It completes its development in 42-64 days.



Description: Yellow foxtail forms a coarse, upright or prostrate, bunch-type grass. It usually branches at the base and may root at lower nodes. Growing up to 4 feet tall, yellow foxtail emerges from a shallow, fibrous root system and normally has flattened stems that are reddish near the base.




Description: Large crabgrass is a widely distributed summer annual grass that germinates throughout the summer. However, new seedlings may begin to appear as early as February. Seedlings sprout quickly, forming a clump with extensive roots where soil is moist. The large crabgrass seedling is pale green and covered with coarse hairs. It has a membranous ligule and no auricles. Young leaves are rolled in the bud. Leaves unroll as they grow out of the center.



Description: Goosegrass, also called wiregrass, is an annual that grows as a compressed plant in turf. Leaves are distinctly folded and may be smooth or have a few hairs. It’s found in a wide range of settings, but tolerates compacted, dry areas where desirable turfgrasses have thinned out. It appears as a whitish silvery mat, forming a pale green clump with flattened stems in a low rosette. Flower stalks are short, stout, and compressed.



Description: Yellow nutsedge is a perennial plant that reproduces primarily by small underground tubers called nutlets. Yellow nutsedge can also spread by rhizomes (below ground stems). Yellow nutsedge is most easily identified by the triangular shape of the stem. If you roll the stem of the plant in your fingers, you should be able to feel the triangular shape. The leaves are light green to yellowish in color and are very slick or waxy to the touch.



Description: Orchardgrass (Dactylis glomerata L.) is a bunch-type, tall-growing, cool-season perennial grass. It is one of the most productive cool-season grasses, tolerant to shade, fairly drought resistant with moderate winter hardiness. Orchardgrass does not exhibit as much tolerance to drought or winter hardiness as tall fescue and bromegrass. It has been reported growing in the United States since before 1760.