music~maker
Shohin
Back to the original post. If you are that concerned about a degree or two either way, for regular wiring, you are looking WAY to deep into it and will likely kill plants with to much TLC...
For conversation, I see no reason not to use copper to wire in a plant other then cost. Most use modern substrate and with all that water I see no reason to believe for a moment the copper would break down and harm a plant. Think about how long copper household pipes last...
Grimmy
Yeah, that logic makes sense. I did some digging and came up with this thread: https://www.bonsainut.com/threads/wire-usage.17340/
In that thread, people were essentially arguing the exact opposite (that aluminum is toxic), so I'm guessing that the truth is closer to what you said.