|how do i get rid or kill or take up a fully grown pompas grass...|
|The best approach is to dig it out, roots and all. Start by cutting the foliage down to get it out of the way and to keep the razor sharp edges from cutting you as you work around the plant. Dig all around and then start removing the soil, one shovelful at a time until you can pry the rootmass out of the ground.
Best wishes with your project!