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

https://telegra.ph/ElectroCulture-Yield-Trials-Setting-Up-Controlled-Comparisons-05-19

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.