Gardeners across the UK are being encouraged to consider an unusual tip that’s gaining popularity online, pouring Coca-Cola onto soil to improve plant health. While it may sound bizarre, the soft drink’s acidic properties could provide a surprising benefit, especially for acid-loving plants like azaleas.
According to Backyard Boss, the common fizzy drink may help lower the soil pH, creating a more hospitable environment for plants that thrive in acidic conditions. “Azaleas are beautiful flowering plants known for their vibrant colours and ability to thrive in acidic soil,” the site said.
“As a gardener, it’s essential to provide the proper care to ensure the health and vitality of your azaleas.”
The logic behind the tip lies in the composition of Coca-Cola. The drink contains phosphoric acid, citric acid, and high levels of sugar, all of which can alter soil conditions when poured directly into garden beds.
While the acids may help reduce pH levels in alkaline soils, making nutrients more available to acid-loving plants, the sugar content raises concerns about attracting pests and potentially disrupting microbial balance.
Experts caution that, while the idea of using Coke as a soil amendment may have some merit in isolated cases, it should be used sparingly and with care.
“There’s limited scientific evidence supporting the regular use of sugary sodas in the garden,” said a spokesperson from the Royal Horticultural Society.
“But in theory, very small amounts could slightly lower soil pH in alkaline conditions. That said, there are far better and safer ways to achieve the same result.”
Safer alternatives for acidifying soil include adding pine needles, peat moss, or sulphur-based soil acidifiers, all of which are recommended and tested by gardening professionals.
Still, the Coke tip has captured the imagination of DIY gardeners looking for quick fixes and unconventional methods. As always, those experimenting with non-traditional techniques are advised to test soil regularly and monitor plant responses closely.
While Coca-Cola might not replace traditional garden treatments, its acidity could offer a temporary tweak, especially for gardeners tending to azaleas and other acid-loving blooms.