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Perennial Weeds

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  • Bermudagrass
  • Field bindweed
  • Johnsongrass
  • Sedges
  • Swamp Smartweed
  • Common knotweed

Use the photos below to identify weeds in the field. Names link to more information on identification and biology.

Click on photos to enlarge
Seedling of bermudagrass.
(Cynodon dactylon): Grass family; perennial; first leaves with somewhat rough surface; ligule surrounded by ring of hairs with tuft of long hairs on either side; auricles absent; stem flat, wiry, and without hairs.
Seedling of field bindweed.
Field bindweed
(Convolvulus arvensis): Morningglory family; perennial, with most new shoots and seedlings emerging in spring; seed leaves nearly square, with shallow notch at tip; early true leaves spade shaped; petioles flattened.
Johnsongrass seedlings.
(Sorghum halepense): Grass family; perennial; persists and spreads via underground stems (rhizomes), which are thick, fleshy, and segmented; roots and shoots can rise from each rhizome segment; leaves have a prominent whitish midvein.
Young yellow nutsedge plant
(Cyperus spp.): Sedge family; perennial; first leaves inconspicuous and grasslike; grow mainly from tubers or "nutlets" formed on rhizomes, mostly in upper foot of soil; in cross section, leaves V-shaped, arranged in sets of three at base, and stems triangular.
Flowering stem of swamp smartweed.
Swamp smartweed
(Polyognum coccineum): Buckwheat family; perennial; leaves are alternate, oblong, and taper at each end; enlarged nodes and prominent sheath.
Seedling of common knotweed.
Common knotweed
(Polygonum arenastrum): Seed leaves are long, very narrow, rounded at the tip and light green with a white cast. The true leaves are much broader, emerging from an encircling, membranous sheath at the leaf base.

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