Does anyone know an effective way to kill, with malice and definitely, these little green thistles. I have tried using something called Brush Killer, and it doesn't kill the roots. The roots of these thistles, by the way, are epic. They are conical bulbs, and extremely hard to dig up. The thistles are crowding out the leaves of the hedge, ruining it! Maybe the best "solution" I can hope for has to be, trim, trim, trim, trim????? Just keep cutting this stuff and hope it gets discouraged? I suppose that is what I will try next, unless I get a better idea from someone here. These nasty thistles are all throughout the front half of the hedge. Thoughts? Recommendations? Commiserations? Oddly, I saw a close relative of this plant for sale in Home Depot - it looked exactly the same except it had no thorns!