Materials matter: copper resists corrosion and conducts well

https://www.scribd.com/document/1032414459/ElectroCulture-for-Balcony-Herbs-Fresh-Flavor-Year-Round-205936

Materials matter: copper resists corrosion and conducts well, while galvanized steel is cheaper but heavier; choose durable wood or bamboo for masts, and avoid treated lumber that may leach chemicals.