Stems, leaf stalks and sheaths are all covered in short fine hairs, though may be sparsely hairy in the upper plant.įruit is flattened, oval to heart-shaped, ¼ to ½ inch long, matures to brown and splits into 2 seeds. Stems are single, erect, few to many branched, stout and hollow. The leaf stalk is long and sheathed where it clasps the stem. The end leaflet is largest and lobed in 3 parts each lobe may be further divided. Leaves are palmately compound in 3's, softly hairy, with fine sharp teeth around the edges, to 18 inches long and wide near the base of the plant, becoming smaller as they ascend the stem. One plant has a few to many flower clusters, at the tips of branching stems and arising from the upper leaf axils. There are 5 white tipped stamens surrounding the creamy button center.Īt the base of the umbel and each umbellet are 4 or more green, lance-linear bracts as long as or longer than the individual flower stalks, but they tend to drop off by fruiting time. The flowers on the outer edge are larger and have more deeply divided petals of unequal size. Individual flowers are about ¼ inch across with 5 white petals notched at the tip. MEDIA: For more information on Weed of the Month, contact Allen Sommerfeld, MDA Communications, at or 65.Flowers are in flat clusters (umbels) 4 to 8 inches across, each cluster made up of 15 to 30 smaller clusters (umbellets) of up to 30 flowers. Photo caption: Wild parsnip infestation (Minnesota Department of Agriculture) Understanding the plant you are targeting, and using different management strategies at effective times, is necessary to develop an effective management plan. This booklet has pictures, plant descriptions, management recommendations and a treatment calendar to help you form a plan of what will be most effective at a certain time. If seeds are present on the plant, chemical application is not recommended or effective.Ī great resource to help develop a management plan for most specific noxious weeds found in Minnesota is the Minnesota Noxious Weeds Booklet created by the Minnesota Department of Transportation. If timed properly, chemical application can target flowering second year plants and year seedlings. You will need to consult the herbicide label to understand where it can be used and when it is most effective. There are a range of herbicides that have been proven effective. Herbicides are another useful management tool but have to be timed correctly in order to be effective.Mowing can be successful and effective management can be seen typically after 3 years of repeated mowing. Seeds produced at this time will not be viable, and typical regrowth will not develop fertile seeds before weather conditions prevent further growth. Mowing is most effective if completed after the flowers have emerged but before the seeds are enlarged. Typically after mowing the plant will re-sprout and still be able to produce a flowerhead and seed. Mowing is effective if timed properly.If seed is present be sure to dispose of the plant effectively and not to spread seed to un-infested areas. This will ensure that the plant will not re-root or produce seed. Hand pulling and cutting can be efficient as long as a portion of the root has been impacted at least 1-2” below the surface of the soil. Here are key management strategies taken from his study: Mark Renz, an Associate Professor and Extension Specialist for the University of Wisconsin-Madison did a case study on wild parsnip. It is very important to use protective clothing, goggles or facemask and gloves. Wild parsnip produces a sap, that when combined with sunlight, can cause a blisters and swelling ( Phytophotodermatitis). NOTE: Use caution when working with this plant. Seeds lack substantial germ coatings, and do not persist in soil for extended periods of time. In late spring to early summer, second year plants will bolt, flower and produce dozens of seeds. Wild parsnip develops rosettes in its first year, and this is a great time to scout and form a management plan. It is spreading throughout Minnesota, and effective management can be tricky. Wild parsnip (Pastinaca sativa) is a non-native biennial plant that produces a rosette in its first year and bolts, producing a seed head in its second year of life. Creating a multi-year management strategy that targets timing in the lifecycle is necessary for success.īefore targeting a plant, it is important to understand the plant and its lifecycle. Every plant is different and treatment timing for one plant is completely different from another. The key to effective invasive plant management is disrupting the lifecycle of the plant. Having trouble viewing this email? View it as a Web page.Īugust Weed of the Month: Treatments and Timing of Wild ParsnipĬhristina Basch, Minnesota Department of Agriculture
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