<https://forum.michiganinvasives.org/index.php?/topic/2216-bull-thistle-management/#comment-2494>
<http://schema.org/text>
"Manual removal is most effective before it flowers.  Asparagus knives (something like this) or other weed forks are really great for getting out the taproot.  You can use herbicides too, but get excited about surfactant because it takes a fair amount to penetrate the crazy trichomes/prickles.\n \n"
<https://forum.michiganinvasives.org/index.php?/topic/2216-bull-thistle-management/&tab=comments>