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' Nelson Mining Resource <br /> Integrated Noxious Weed Management Plan <br /> August 2019 <br /> Page 6 <br /> the stalk. A prolific seed producer, common mullein seeds can remain viable in the soil <br /> ' for 100 years. Common mullein is a List C noxious weed and is frequently found in <br /> pastures, roadsides and dry disturbed sites. <br /> ■ Field Bindweed (Convolvulus arvensis): Field bindweed (Convolvulus arvensis) is a <br /> non-native deep-rooted perennial that reproduces from seed and creeping, horizontal <br /> ' roots (rhizomes). Field bindweed stems prostrate (grows low to the ground) and twine <br /> and grow up to 6 feet long. Leaves are distinguishable by their arrowhead shape. The <br /> flowers are bell or trumpet-shaped, white to pink in color, and are about 1 inch long. <br /> ' Field bindweed seeds can remain viable in the soil for up to 40 years. <br /> Field bindweed emerges from its root system in the spring. Flowering occurs from June <br /> ' to September and until the first fall frost. The number of seeds produced per plant ranges <br /> from 25 to 300 and seed production is variable depending on environmental conditions. <br /> Field bindweed is an extremely difficult noxious weed to control because, in part, of its <br /> ' root that may go 20 feet deep into the soil, and which repeatedly gives rise to numerous <br /> long rhizomes. <br /> ' 2.2 POTENTIAL INVASIVE WEED SPECIES <br /> The following is a list of potential invasive weed species that are not present but known to be <br />' within the general vicinity of the Site. Future noxious weed site visits conducted as part of this <br /> plan will include observations for these weed species. Additional information about identification <br />' and control are provided in the fact sheets presented in Appendix B. <br /> Noxious Weed Species Identified State List <br />' (Scientific Name) <br /> Hairy Willow-Herb A <br />' Diffuse Knapweed B <br /> Hoary Cress B <br />' Leafy Spurge B <br /> Perennial Pepperweed B <br /> Russian Knapweed B <br />