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

https://www.scribd.com/document/1033772440/ElectroCulture-for-Vertical-Gardens-Going-Up-with-Growth-221860

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.