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

https://www.scribd.com/document/1026628805/Electroculture-How-to-Measure-Plant-Response-to-Electricity-201386

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.