Potatoes-in-a-barrel

See these 2 blue barrels? They've got a hefty layer of compost and leaf mold in them with some French Fingerling potatoes buried in. As the potato plants grow past the compost-line, we just throw on more compost and more potatoes will grow. Once we hit the top we'll harvest a whole barrel of potatoes... a technique we learned a la John Seymour.