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I do not try to grow things where I spray. I just do not want to deal with the weeds/etc. that I spray - I want it to go away because I do not want to have to walk thru brambles and thistles and I do not want brambles to take over areas of my property - which they are constantly trying to do. I have never had any problems with dead spots anywhere on my property - at least not more than one growing season. The next year something grows there no matter what the soil is, even if it is two feet of gravel. I even have stuff growing up thru my asphalt.Hey man, I don't recommend this. You see, glyphosate is actually not a poison (surprise!), it is something much much worse than most people realize. Glyphosate is both a chelator and also an antibiotic.
As a chelator, it is highly negatively charged and hence attract positively charged elements in plants and soil. In fact, when glyphosate was first invented, it was used to clear pipes clogged with minerals.
It is also a very powerful antibiotic, it kills all beneficial microbes in the plant and the soil.
The way it works on plant, is that it sucks up all the nutrients in the plant and the soil, and also kill off all the beneficial microbes. This weaken the plant and encourage bad microbes and fungus to attack and hence eventually kill the plant. If you grow a plant in sterile soil and spray glyphosate on it, it will be stunted/weakened, but it will not die.
In other words, when you use a highly concentrated glyphosate in your property, you're essentially removing nutrients and beneficial microbes in your soil, and encourage bad microbes and fungus to grow. Do this enough times at high concentration, and you'll find that many things won't grow properly on your soil.
I would say just mix a triclopyr based product with diesel at the labeled concentration, for blackberry you'll want to spray at the right time, and be patient, they will die but just not immediately.