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Curlycup gumweed Grindelia squarrosa Sunflower Family Key identifying traits Plant stems grow 1-3’ tall with fibrous roots Plant stems turn brown with maturity Leaves are alternate, 1-3” long with saw-tooth margins Flowers are yellow and about 1” in diameter Curved bracts around the flower secrete a sticky resin giving the plant its name Seeds are oblong and cream colored Biology and ecology ¾ A biennial or short lived perennial plant reproducing by seed ¾ Curlycup gumweed is native to the U.S. ¾ It is found in pastures, rangelands, along roadsides, and in waste areas ¾ It is highly drought resistant ¾ It is unpalatable to livestock but was used by Indians for treatment of asthma, bronchitis, colic, and skin rashes Control Prevention – Learn to identify plants; start monitoring early in the season Biological – No known biological control in our area Cultural – Plant competitive grass or other cover crops Mechanical – It can be hand pulled but does not grow upright enough to be effectively mowed Chemical –the PNW Weed Management handbook lists it as a problem weed and recommends 2,4-D ester, dicamba, picloram, and metsulfuron as control herbicides for gumweed. Where found – Widely scattered throughout the county as well as most of the continental U.S. and Canada All Photos Richard Old, XID Services, Inc. Stevens County Noxious Weed Control Board, January 2010