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Common Teasel Identification and Management <br /> an study, common teasel resprouted 50% <br /> of the time after mechanically removing <br /> above ground vegetation. Common teasel <br /> 'J <br /> can produce more than 2,000 seeds per <br /> plant. Plants die after production of seed r :5 <br /> has occurred. Seeds can stay viable for up ' <br /> to 14 years. Seeds germinate and estab- <br /> lish readily, however, seeds don't gener- <br /> ally disperse far form the parent plant. <br /> _ <br /> The fruits are a four-angled achene, each <br /> containing a single seed. i <br /> Common teasel is native to Europe i <br /> where historically it had many uses. v-`'" <br /> ©Steve Dewey,UTSWeUnWer$lr,•ugwv d Common teasel is spreading rapidly <br /> Common teasel, Dipsocus fullonum <br /> in America. It is common along major <br /> L., is a biennial or sometimes short- travel corridors and previously disturbed <br /> lived perennial forb. Mature plants can areas. It is invasive in moist soils, such :Re�enee,,vrsw�e ,,Fsn;a�E.va <br /> fens and riparian corridors. <br /> grow up to or over six feet tall and have a as wetlands, - <br /> taproot. Common teasel has simple Ian- This includes roadsides, swales, irrigation <br /> ceolate to oblanceolate basal and stem ditches. Upland dry sites are also vulner- <br /> Lga <br /> leaves. Both leaves are conspicuously able.These include open, sunny habitats <br /> veined, wrinkled and have rough surface. such as abandoned fields, pastures, �. <br /> Leaf margins are crenate. Stems leaves meadows and woodlands. a <br /> are lined with stiff prickles along the mid- <br /> estoration of infested and degraded ' o <br /> rib. Stem leaves are opposite, net-veined, (n <br /> stalkless, and clasp the stem.The stem is sites is one of the keys to eradicating OChrk Evros,ILW reAdW Han 0 <br /> rigid and also lined with several rows of common teasel. Wetlands are impor- <br /> downward turned prickles. tant but very sensitive environments. + O <br /> Methods and techniques used in infested <br /> wetlands should follow best manag- <br /> Flowers are range from white to violet. <br /> The flower head is generally egg- ment practices, such as those available <br /> shaped, with a square base.The long at https://www.colorado.gov/pacific/ag- �I V_ <br /> thin stiff floral bracts at the base of the conservation/noxious-weed-publications. :_ � •\ A r <br /> . .. : ' .�� <br /> inflorescence are generally longer than Preventing seed production is necessary <br /> to curtail the spread of this forb. Eradi- ` — <br /> the flower head;these also have prickles. cation efforts will need to continue for °`�'&'^��°^•^°^� • <br /> It flowers from April to September.This multiple consecutive seasons until the <br /> species reproduces by seed. In a Canadi <br /> seed bank is depleted. Once eradication <br /> 2015 Quarter Quad Survey is complete, monitoring will <br /> be needed. <br /> rr PointsKey ID <br /> ...Common B Cudeai Tea-el -4 C. waa Fern s„Ks tau wuy�.aro.u,..,.a.�., <br /> Opaaais Alm—&D fernier✓- 39,Wwnn Calormlo <br /> --- Common teasel is desig- • slender <br /> nated as a "List B" spe- floral <br /> " ties in the Colorado Noxiousextend beyond <br /> Weed Act. It is required to the topof <br /> p be eradicated; some popula- flower head. <br /> tions may be contained or <br /> 2. Leaves are <br /> ^� suppressed depending on <br /> crinkled and <br /> state regulations. For statehave prickles. <br /> j regulations described for <br /> I 4•m• each county, refer to the 3.Stems are stiff <br /> ~� most recent Rule, or visit and have rows <br /> www.colorado.sov/a /co of prickles. <br /> " "" weedcontacts for details. <br />