Hello All,
I have a birdbath for the bees, which gets a fair amount of bee visits in these hot months.
I’ve heard that adding a few old pennies can greatly reduce algae growth, and also discourage mosquitoes. Has anyone tried this? Is copper toxic to honeybees?
(I would use pre-1982 pennies only, as they contain 95% copper. Newer pennies are 95% zinc which is supposedly toxic to birds, and won’t stop algae.)