I did an "experiment" this year with growing potatoes in 30 gallon Rubbermaid tubs. Well, I ran out of potting mix so one tub had maybe 1 bag of mix in it and the other probably about 2. Drilled holes and lined the bottom with weed cloth. Each had 3 whole seed potatoes planted in it (Sangre red & purple majesty) in early April. They grew really well. Well, I got impatient and decided it was time for new potatoes and I didn't feel like digging up my field crop just yet. So, I dumped out the bucket onto a tarp and me and the kiddo went hunting and this is what we found:
One of the nicest things about these tub taters is when the hail came in May/June, the plants hadn't grown over the top of the tubs yet so all I had to do was put the lid on and they were protected. Same for frosts/snow. Harvesting was a breeze, just dump out the tub on a tarp and start sifting. No digging, no damaged spuds. If I had to do it all over again I would have left them longer, The plants were loaded with tiny tubers and if I had given them until the end of this month or longer I would have gotten a lot more.