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

https://www.scribd.com/document/1032414459/ElectroCulture-for-Balcony-Herbs-Fresh-Flavor-Year-Round-205936

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.