Fossil Farm
Platinum Member
A mixture of glyphosate and triclopyr (Ortho Brush Killer or Bayer Brush Killer) works well and is not too expensive. Be sure to spray early in the season. Around here that is usually May. Like there is nothing else to do in May. By mid-June it has a good chance of coming back. Be sure to wet all leaves of the plant. The other herbicides mentioned are good also, just depends what you have access to purchase in your area. Add a few drops of dish detergent, like Dawn if you are using a hand sprayer or a crop oil to cut through the surface tension of the leaf to allow the herbicide to do a good job. Good luck.