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

https://telegra.ph/ElectroCulture-Gardening-Journal-Track-Your-Progress-Month-by-Month-05-18

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.