It would help but no it can't completely keep it pest free
They eat pest insects that would harm your garden.
Garden snails !!
Termites
arachnid ant aphid
slug, i think!
You can try Fertilo which is a very organic pesticide. There are plenty of other means that can keep you and your garden safe from pest.
a Mole
Greenfly don't eat the whole plant, but if you had a big garden they would be some pest!
Crows, aphid
There are many different stores that sell Pest Offence products. The best place to look would be at your local garden center or home improvement retail location.
spitter bug
Yes, you can identify pest droppings in your home or garden by their size, shape, and location. Common pest droppings include small pellets or droppings that may be dark in color. It is important to properly identify the droppings to determine the type of pest present and take appropriate action for removal.