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

https://riverjdky783.almoheet-travel.com/is-electroculture-right-for-you-a-decision-making-guide

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.