For balcony growers, compact coil pots use a small copper helix inserted into the medium

https://www.scribd.com/document/1034536759/ElectroCulture-for-Culinary-Gardens-Flavor-Forward-Growing-229124

For balcony growers, compact coil pots use a small copper helix inserted into the medium, aiming to localize subtle charges near roots without requiring tall poles or complex grounding arrangements.