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

https://blogfreely.net/galenacmeo/electroculture-in-raised-beds-designs-depths-and-spacing-strategies

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.