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

https://thrivegarden.com/pages/which-is-more-affordable-electroculture-tools-or-traditional-gardening-equipment

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.