A potato planter. Saw a video.
1. Get two large, heavy duty flower pots, that can nest in each other.
2. Cut large "windows "in one; big enough to get your hand in, but leave enough of the pot for structural stability.
3.Pot window pot inside intact pot.
4. Put in potting mix, and a few old sprouting spuds. Cover spuds, but only half full with potting mix.
5. As spuds sprout, they displace potting mix. May need to add more mix to keep spuds covered.
6. To pick spuds, lift out inside pot, stick hand through window. No need to dig up half an acre of ground for spuds!
Well that's the theory. I went a bit overboard and bought pots with excellent structural integrity. Nothing a drill and hacksaw blade won't fix!
We'll see how the spuds grow.