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

https://medium.com/@iortusfkny/electroculture-in-high-tunnels-consistent-growth-year-round-26e28862b96e

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.