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

https://sergiozseb745.lucialpiazzale.com/electroculture-and-soil-microbes-what-we-know-so-far

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.