What, exactly, is in the water that will react with the copper plating on the pennies, allowing free radicals of copper to swim about the plant stems?
Maybe a teeny, weeny drop of actual copper fungicide would work as well … or better.
If nothing, the pennies will be cleaner.
What, exactly, is in the water that will react with the copper plating on the pennies, allowing free radicals of copper to swim about the plant stems?
Maybe a teeny, weeny drop of actual copper fungicide would work as well … or better.
If nothing, the pennies will be cleaner.