Gardeners urged to avoid common trick to deter slugs as it 'makes things worse'
![Gardeners urged to avoid common trick to deter slugs as it 'makes things worse'](https://i2-prod.mirror.co.uk/incoming/article32938812.ece/ALTERNATES/s615/0_Slug-on-damaged-hosta-leaf.jpg)
Gardeners have long been told that a layer of crushed eggshells on the soil will put slugs off crossing it - because the shells are too spiky and uncomfortable for them to crawl over