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

https://setharto354.bearsfanteamshop.com/electroculture-antenna-aesthetics-discreet-vs-statement-pieces

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.