Thank you both. We did get our money's worth as far as I'm concerned; our entire yard was hopelessly overgrown and it took 4 men 9 hours to get it cleared out. This is just one plant in one small bed, and I didn't specifically ask them to remove these plants. That was my mistake. My guess is that they assumed they were lilies that I wanted to keep. They did a perfect job with everything else so I'm not at all dissatisfied with them. Knowing what they are and what to do really helps me; I can go out and dig up some of the roots and thin them out, and then see what happens next spring. They have been in for 10 years and never flowered, but perhaps they've always been too crowded. I'll give it a try and see if I get any blooms next year. Thanks for your help!

The spay I have used includes the following chemicals: - Dicamba 0,5% - Dichlorprop-P 2,2% - MCPA 7,5%

Last spring , I had a huge crop of it everywhere and I tore it out all spring and hauled it off to the compost heap. When it flowered I pulled the seed heads and bagged them and composted the rest. Irritating plant. Bugs,beetles, flies, bees and butterflies seem to like it. They seem to die in the summer heat and dryness here.

This just showed up in my yard in Gun Barrel City, TX in the last 2 years and is taking over! Never seen anything like it. It is spiky and will stick your feet if you walk barefoot on the grass.