It's snails. They absolutely love sweet basil and a handful of them can completely devour a whole plant in one night where we live (London, UK). That is why we will never ever plant basil outdoors, in a bed or frame, or in an outdoor pot. Pots on outdoor windowsills or on the shelves in the greenhouse are also not safe, and no amount of slug pellets will stop them - who wants to scatter poison around an edible plant anyway? The kitchen windowsill (inside) is the only safe place. PS. the digging is birds, foxes etc. going for the snails.
It's snails. They absolutely love sweet basil and a handful of them can completely devour a whole plant in one night where we live (London, UK). That is why we will never ever plant basil outdoors, in a bed or frame, or in an outdoor pot. Pots on outdoor windowsills or on the shelves in the greenhouse are also not safe, and no amount of slug pellets will stop them - who wants to scatter poison around an edible plant anyway? The kitchen windowsill (inside) is the only safe place. PS. the digging is birds, foxes etc. going for the snails.