Here’s a neat link I found that talks about worm tubes for your garden. Worm tubes are wide pipes, partially buried throughout the garden, with holes cut in the buried ends. food scraps are dropped into the pipes to attract worms to enter to tubes, thereby leavings their precious wastes in your garden. The tops are covered loosely with a pot or cap to prevent flies, so the entire system in super easy, super simple, and lasts a lifetime!
Here’s the link: http://www.garden.org/regional/report/arch/inmygarden/3430