Last night I had to declare war on these cute little flowers in my garden. I don't know where they came from; they might have been part of some "remainder" garden center plants that someone gave me a few years ago, but I don't think so. They only grow to about 12 inches, and end with nickel-sized, lavender-tinted white flowers with yellow centers. They are pretty and sort of subtle.
However, the stems also bear needle-like thorns. I tolerated this when it was only growing in one small patch of the garden, because I didn't really have to do anything with it. Now, though, there are seedlings popping up in the yard nearby, and the seedlings have thorns, too. They would be quite painful to step on barefoot.
With grim resolve, I put on leather gloves, grabbed a spray bottle of Roundup, and attacked the plants. I pulled up the ones I could find in the yard (there were fifteen or twenty), and sprayed carefully around the sweet corn, asters, bee balm, and mint to destroy what I could find in the garden. Something tells me the fight's not over yet, though.