Will 41% glyphosate kill tall thick weeds like dog fennel? I have a large area of planted pines that has been thinned and is now overgrown with tall grass and weeds. Some of these weeds are 5ft in height and have very thick stems. I want to clear a few areas out for lanes, food plots and paths using my atv sprayer but not sure if the glyphosate will kill everything. I'd rather not pay for that much chemical to find out it doesn't work so if there is a better chemical out there for this type work let me know.