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

https://medium.com/@kattervbag/electroculture-for-beginners-simple-setups-and-safe-practices-5cf691020956

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.