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

https://jaspercymx504.cavandoragh.org/electroculture-and-biodynamics-can-they-work-together

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.