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

https://www.scribd.com/document/1026190271/Electroculture-at-Scale-Small-Farm-Applications-127430

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.