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Potato

Perennial Weed Seedlings

On this page
  • Field bindweed
  • Nutsedges
  • Quackgrass
  • Canada thistle

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

Click on photos to enlarge
Seedling of field bindweed
Field bindweed (perennial)
(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.
Quackgrass
Quackgrass
Elytrigia repens (=Elymus repens): Grass family; perennial; occurs in cooler Northern California and coastal areas; first leaf blade narrow with short, membranous ligule that is minutely fringed; auricles may be undeveloped or difficult to see; leaf blades light green or covered with a white bloom; sheaths smooth or hairy; difficult to distinguish from other grass seedlings; perennial rhizomes develop by the 6- to 8-leaf stage.
Young yellow nutsedge
Nutsedges
(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.

Canada thistle
Canada thistle
(Cirsium arvense): Sunflower family; perennial; scattered throughout California except southern Sierra Nevada, southern deserts, and Channel Islands; seed leaves oval to oblong, fused at base, shiny midvein on lower surface; first leaves alternate, taper to a winged stalk at base, margins slightly wavy to unevenly toothed, surfaces covered with stiff hairs.


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