Gardening Myths How many pennies should you put in a bird bath? March 8, 2026 by Tanp | Leave a Comment You’re likely wondering how many pennies to put in a bird bath to deter mosquitoes. While a common myth suggests pennies can prevent mosquito larvae, there’s no scientific evidence to support this. Mosquitoes don’t lay eggs in clean water, and the presence of pennies won’t change that. The Penny Myth: Does Copper Really Deter Mosquitoes? […] Read more ยป