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

https://www.scribd.com/document/1022096783/Garden-Design-Principles-with-Electroculture-in-Mind-166143

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.