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

https://telegra.ph/ElectroCulture-for-Fruit-Trees-Techniques-and-Case-Studies-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.