Here is 4 days of progress on killing the grass. I lay down a broken down cardboard box and then use newspapers to fill in the gaps between the flaps of the opened box. Luckily I have an infinite source of recycled cardboard boxes, I have been picking up a small load daily. I now have a wheelbarrow which makes the job way easier. I am aiming for 2-3 inches of mulch on top of the cardboard.