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

https://telegra.ph/Electroculture-Gardening-for-Shade-Gardens-Getting-More-from-Less-Light-05-13

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.