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Foothills Fescue Range Plant Community Guide - Sustainable ...

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The rating noxious weed infestation should be guided by local weed list of noxious weeds<br />

as provided by municipal weed control authorities. This question attempts to identify<br />

noxious (restricted weeds) infestation on a range site.<br />

In the analysis of plot data, three noxious weeds were encountered including Canada<br />

thistle, leafy spurge and tall buttercup. Several nuisance weeds were also encountered<br />

including perennial sow thistle and annual hawk’s beard. Canada thistle was the most<br />

common occurring in about 15 percent of plots. On highly disturbed sites it occurred at<br />

up to 12 % canopy cover. All other weed species occurred at trace levels of frequency<br />

and cover.<br />

68

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