I tried to do an above ground "in the box" type worm farm and it can't compete with my little spot next to the foundation. I lay out flattened cardboard boxes on top of the bare soil in a moist shady area (there is a drippy water faucet there) next to the foundation of my house as soon as the snow melts enough to show soil. I leave this in place till April or May. Then around the first of May I uncover it (there are usually lots of worms at the surface by now) and add shredded newspaper, grass and leaf clippings along with some soil scattered around the layers, additional earth worms that come out on the road after a rain (sometimes I have to make several trips out to the road there are so many), and kitchen veggie scraps that I gently bury in this compost heap all season long. If need be, I shred more newspapers and add that. With little else in the way of upkeep, I have worms all season long. By the end of fishing season I have a nice compost heap that I use to amend my garden and pottings. Then I start again next year.