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

https://jeffreytdct399.iamarrows.com/electro-culture-gardening-in-arid-climates-enhancing-water-efficiency

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.