I've been looking over at the (erhem) marijuana growing forums. They are nuts enough there but have great tips anout getting good growth from indoor plants (that want to be outside). So, an experiment was a nine volt battery, two alligator clips attached to opposite poles of the battery. Two copper or gold conducting wires in the pot, each on an opposite side. Just give it a charge for 5 minutes a day.
I have sworn to myself to conduct this experiment one day!