I'm sorry to say that vine weevil are not just pot dwelling pests. They can be found all over the garden where susceptible plants are grown. Look for the tell-tale leaf-edge damage that the adult vine weevils cause and this will indicate the areas in the garden where the larvae are at large.

There's an info sheet here http://www.just-green.com/8b-PhotoAl...VineWeevil.pdf which you can open with adobe.

Ian