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You remember doing a potato clock back in school, don’t you? Or at least you remember the idea? Well, using the same sort of principle, this clock creates electricity using wet soil from your own two potted plants, enabling you to have your own tiny electrical generator.

It uses electricity created by a reaction between zinc and copper electrodes, which are buried in the soil (you supply two potted plants). In this case, the wet soil becomes the electrolyte (the conductor) that enables the passage of voltage between the two electrodes. This battery can deliver 1.5 volts, but the earth must be kept moist, so don’t forget to water the plants! Handmade in the Netherlands.

Note: the zinc electrode will be consumed after several years of use. Not recommended for use with herbs or other plants you intend to eat.

$39.95, Buy it here.