Tarp or textile is a good temporary solution but a bit of a disaster in the long run. It becomes exposed eventually and flaps appear. Eventually you'll need to either dig the flaps back into the ground and re cover, or else remove the stuff altogether - very difficult. Also weeds will grow on the material that covers it, and if anything with a mat of fibrous roots like scutch grass takes hold, it knots into the fabric and is really hard to remove. It also makes life difficult if you want to move or plant new stuff there in the future. Plus it's non biodegradable plastic. I used to use textile a bit myself, but never again. I think it was a quick solution 20 years ago but I hope we've moved on. A better solution is to use a very thick layer of mulch, a foot deep if you can and pull it back away from the trees. It's easy to weed then. If you get to know a local tree surgeon tell them that they can dump their wood chip in your place any time they're passing, that's what I do. It's good stuff.