Overview

• Gardening specialists advise placing a few copper pennies in bird baths this summer to slow the spread of harmful bacteria and algae.
• Pre-1992 pennies are most effective because they contain 97% copper, though newer copper-plated coins still provide some benefit.
• The copper ions released into the water naturally inhibit algae growth, offering a bird-friendly alternative to chemical cleaners.
• Experts stress the importance of refilling baths every two days and scrubbing them thoroughly whenever algae returns to maintain clean water.
• Bird baths should be sited where visiting birds have clear visibility and nearby cover so they feel safe while drinking and bathing.