Materials matter: copper resists corrosion and conducts well

https://telegra.ph/Electro-culture-Gardening-for-Succulents-and-Cacti-Special-Considerations-05-06

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.