Chemical weed killers, which eventually provide an open field to weeds that are resistant to them
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If 46% Glyphosate at 3 oz gal does not work, then up it to 6. Even 12 if it is 60deg or below. Be sure to include a dollop of surfactant to make it stick and not wash off in the rain.
For weeds with slippery surfaces like cattail or are resistant (sort of yellow up after spraying but do not die) add an equal amount of Mecamine with the Glyphosate
— If 46% Glyphosate at 3 oz gal does not work, then up it to 6. Even 12 if it is 60deg or below. Be sure to include a dollop of surfactant to make it stick and not wash off in the rain.
For weeds with slippery surfaces like cattail or are resistant (sort of yellow up after spraying but do not die) add an equal amount of Mecamine with the Glyphosate
I go medieval on stubborn weeds. A cocktail of glyphosate and 2-4-D, using diesel fuel rather than water as the diluting agent (also servers as surfactant), will burn most any weed all the way to the ground. It's also effective on woody brush, sprouts, multiflora rose, and other undesirable types of scrub.
Obviously such a concoction is not something that you would want to use on your kitchen garden or around your fish pond, but it works great for fencerows, around out-buildings, etc.