I've actually thought about adding electrodes to my soil before, all due to one of the very few things I remember from my grade-school biology class...that small electric pulses stimulates micro-fibers in the roots, or something like that. I'd be weary to try it, though...knowing my luck I'd likely end up electrocuting my plants (or myself) every time I watered! Plus, when the soil is allowed to dry out, I figured the current wouldn't be able travel as well through the soil.

Still though, there are some pretty radical ideas out there...many of which are going to ideal for home gardeners!