I have been trying to "reclaim" a part of my allotment which, despite being covered in balck plastic since before we got the plot (at least 3 years) has become infested with brambles. I have now dug out the main brambles and the decayed plastic but I know there will still be loads of roots further down. I don't think I've got the time or the energy to dig any further down, so i was wondering whether I could plant potatoes on this patch and just chop/dig any brambles that re-appear, or would this be asking too much of the spuds? Would it help to cover with plastic/ textile and plant through it?