Come on folks, that's exactly how potatoes gather their electricity so that they can be used as batteries.
And this sort of thinking is not limited to gardening....
I give you the magnetic wine collar:
"
The Wine Clip® uses principles of magnetics to hyperdecant and improve the taste of wine as it is being poured out of the bottle. The effect is instantaneous, and has been found by many wine professionals to result in a genuine improvement in flavor and mouthfeel, especially when used on red wines."