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Shepherd’s-purse Capsella bursa-pastoris (L.) Mustard Family Key identifying traits A slender, erect plant growing 3-18” tall Basal leaves are deeply lobed while upper leaves are alternate & lance-shaped & clasp the stem 4-petaled flowers are white, very small & located at the end of elongated racemes Seed pods are heart shaped & 2-celled containing many seeds; they are attached to the stem by a long pedicel Biology and ecology ¾ An annual or winter annual plant spreading by seeds ¾ Plants flower early in the spring and can produce seed into September ¾ Shepherd’s-purse is a native of Europe but is now well established in the U.S. and Canada ¾ Commonly found in cultivated fields, gardens, waste areas, pastures and road sides ¾ Usually not considered aggressive but has been found to be a nuisance in fields and pastures if it is left alone, and can be a problem in grain crops Control monitoring and planning for early season control Biological – No known biological control in our area Cultural – Plant competitive grass or other cover crop with certified weed free seed Mechanical – Tilling and mowing can be effective if done before flowering occurs. Chemical – Mustards are resistant to many herbicides but dicamba or metsulfuron can achieve good control: the PNW Weed Management handbook has some limited information on controlling mustards Where found – Widely spread throughout Stevens County but can seem small and insignificant compared to other weeds. Photo by Richard Old, ww.xidservices.com Prevention – Learn to identify plants; start Stevens County Noxious Weed Control Board, December 2007