How to Earth Up Potatoes

Yes, you can. Use a potato with good eyes, cut a piece of the potato off, put toothpicks around it to keep it from falling into your glass or container of water, let half set in the water, eyes up. Set it in a window, I prefer the kitchen, and let it grow. Changing the water a couple times a week is good. It might take a while, but you will soon have a vine.

Open the bag at one end and half empty it, saving the compost. Stand it up on its end and roll down the bag to just above soil level. Plant the potato about six inches deep (one per bag should be enough), water, and put in the sun. When foliage emerges and is six inches tall, roll the bag up slightly and add enough saved compost to bag so the stem is two inches above compost level. Repeat every week or so till the bag is full, then leave til the foliage dies, and empty out the potatoes.

Yes, as long as there isn't weed killer or herbicides in the grass clippings; those could kill the potato plants.