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Figure 2. Several views of Canada thistle (Cirsium arvense). <br />Photo' mtn ~'ei erdc usace ar+w.mtl,nm~5 oWntyhtrnrr.~r5~um0 n~ml Availablo 4 Jan 2008. <br />Efforts to control Canada thistle by treating its top-growth only will not bo effective: all control <br />efforts must address the root system instead of or in addition to aboveground measures such as <br />mowing. Canada thistle can recover from almost any stress, including control attempts, be- <br />