@gingerw Roundup (glyphosate) is a non-selective herbicide, it kills what it touches, whereas Weed-b-Gone is selective and only kills the listed plants.
There is a great deal of debate about glyphosate, with lawsuits and all that. I tend to be pretty much a non-chemical gardener but I understand there are times when a specific pesticide may be the least-bad solution. Of all the non-selective herbicides on the market for either home or professional use, glyphosate is among the least toxic and one of the least persistent. It is less toxic to the soil than industrial strength vinegar and table salt, which are often promoted as alternatives by people who object to pesticides. That said, it is still a chemical to be handled with great care and used according to directions and with proper precautions.
I am a University trained Master Gardener and research nerd - my mind was changed about glyphosate after I took a class where it was discussed as a controversial and emerging issue. We were given a lot of research material to peruse, and I did a lot of studying. We were encouraged to make up our own minds based on our own studies and conscience - we were not told what to believe or say.
I still try EVERY other solution first, but do resort to Roundup rarely, like when fighting buckthorn, oriental bittersweet and poison ivy in my yard.
I realize that each gardener in this group has their own opinion about glyphosate and other chemicals - if you want to share yours, please let's keep it fact-based and respectful of others' beliefs.
Happy gardening
Sue