This is how to grow potatoes in a hessian bag in my backyard. I was going to grow them in a self-watering bucket but decided to do something different.

I bought some seed potatoes that had already started to sprout,so I put some quality potting mix in the bag. Spaced them around the bag and covered with about 5 cm of potting mix.

When the potatoes emerged and grew another 10 cm, I added some more potting mix. This continued until the bag was full.