Gardenboy, I am not a big expert on chemicals, but an old friend who worked for a botanical garden used to talk about Glyphosate gel, not liquid, for painting on stuff the way you are talking about. I don’t think it’s available in all areas of the country, but that’s the only use of it I’ve heard of for such tenacious stuff. Will you be crossing state borders to import contraband?????? Margaret
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.