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

https://thrivegarden.com/pages/importance-of-research-and-development-in-electroculture-gardening-pricing-strategies

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.