Earthworms

[drache]

Drive a wood dowel rod into the ground, leave about 8 inches showing above the surface, then rub a hardwood plank back and forth over the top of the wood peg.

The resulting vibrations drive worms crazy, they will surface rapidly

thanks
how deep do you drive the dowel into the ground?
I like that method better, as it doesn't involve long extension chords and it has a slightly lower carbon footprint