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

https://www.scribd.com/document/1022498100/Electroculture-for-Nitrogen-Fixers-Beans-and-Peas-148057

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.