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

https://blogfreely.net/galenacmeo/electro-culture-gardening-safety-best-practices-for-home-gardeners

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.