Canada thistle

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Canada thistle:

see thistlethistle,
popular name for many spiny and usually weedy plants, but especially applied to members of the family Asteraceae (aster family) that have spiny leaves and often showy heads of purple, rose, white, or yellow flowers followed by thistledown seeds (a favorite food of the
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References in periodicals archive ?
In fact, many farmers even insist that quackgrass and Canada thistles are blessings in disguise because their presence necessitates more intensive preparation of the seed bed, and better and more frequent cultivations of the crop than is often otherwise given.
The Canada thistle does not have rootstocks like the quackgrass, but has true roots, the parts of which are capable of producing plants.
For this reason all grass and clover seed should be carefully examined before sowing to make sure that it contains no Canada thistle seed.

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