Why surrounding your plants with crushed eggshells won’t deter slugs

A tip I’ve come across at least once a week while gardening is the idea that a ring of crushed eggshells placed around plants is an effective and natural barrier to slugs and snails. As more and more gardeners are keen to avoid using pesticides, could this age-old tip become increasingly important for home growers? Let’s look at the science.

Here’s how it will work: The sharp, rough edges of crushed eggshells…