As the weather heats up this week, experts are urging gardeners to put copper coins in their birdbaths to protect birds from a common summer problem
Garden enthusiasts are being encouraged to pop a penny in their bird baths this week, as a simple solution to a common summer issue. Bird baths are a favourite feature in many gardens, offering a source of fresh water for a variety of birds, from robins and redwings to chaffinches, magpies, starlings and crows, to drink and bathe.
However, during the summer months, particularly with the warm weather predicted this week, clean drinking water can become scarce. This is especially true as more rural areas are transformed into housing estates and roads, reducing the natural habitats available for our feathered friends.
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A further issue is the growth of algae, a green plant matter that can contaminate water with bacteria, potentially spreading disease and harming birds. This is why gardening experts are advising people to place copper coins, such as 1p and 2p pieces, in their bird baths, reports the Express. These coins can help inhibit bacterial growth in the water, slowing down the spread of harmful bacteria.
Coins minted before 1992, which contain a higher copper content, are most effective, but newer coins can still have some impact. Prior to 1992, UK copper coins were made up of 97% copper, but this was changed to copper-plated steel in 1992.
Pergolux UK advises on bird bath cleanliness by stating: “Algae in bird baths can occur from debris falling into the water, which is why it’s important to refill them every couple of days. If you notice algae is persistently coming back, then give your bird bath a thorough cleaning and place a copper coin into the fresh water. This can help slow down the growth of algae.”
House Digest provides insight into the underlying process: “The copper in the pennies releases ions, which slow the algae growth in water.” They also note the precautions and attraction strategy: “While large quantities of copper can be harmful to birds, small amounts are safe, allowing you to use a few pennies in the bottom of your bird bath to keep the water clean and fresh.
“Since many birds, like crows and blue jays, are attracted to shiny objects, the pennies can also help you attract them to your yard and garden.”
Maintaining effectiveness requires regular care: “For best results, replace the pennies every few months. The coins are an excellent alternative to harsh chemicals and cleaners which can be harmful to wildlife and the environment.”
They also recommend additional maintenance steps: “While the copper pennies will help keep the water clean, it still helps to switch out the water whenever you water your garden or yard, particularly in warmer climates.”
