I've said it before and I'll say it again. Worms are a pet that just keeps on giving. They only give you joy and are great little gardeners.
If you're a worm fan, or just starting out, this is a great way to get worms to do lots of the gardening for you. You feed them your food scraps in a 'tower' or tube, they come and eat it, then explore the garden doing their wormy business all through the soil. This makes your garden rich, fertile and bountiful ...and all you've had to do is feed the little worms the right stuff.