The Canada thistle is the toughie. It has a lighter green foliage that is narrow. It can also reach heights of 3 feet and also has purple flowers. Both thistles have seeds like dandelions that can blow in the wind. In the summer, I have been driving along some city roads when the air is full of the seeds blowing in the wind, much like dandelions parachuting their way into new territory. I know they are thistles because the seed heads can be seen along the roadsides where the weeds have not been cut.
Canada thistle spread by underground rhizomes. Rhizomes are underground stems. If you see one Canada thistle, it is likely attached by a rhizome to another plant a little ways away. If you are planning to dig out the Canada thistle, make sure to dig out the rhizome. If you don’t it will regrow, and you will still have thistles. Canada thistle does not respond well to herbicides. The plants will be killed off, but often the rhizomes continue to live and soon it will send up new sprouts from underground. Only continuous attacking of the Canada thistle will suffice to eradicate this pest from your lawn or garden.
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