Posted: 21/07/2012 at 20:56
Are you sure they are mice? I have to admit I've never come across this behaviour from mice. Rats - yes, but their holes are bigger.
Have you actually seen the culprits? I think you may need to be a little surer before a solution to the problem can be found.
I put up with mice in the GH (although they have a dreadful habit of pinching seeds or eating choice seedlings) but I have never seen the problem outside in the way you describe. There may, however, be people on this board who know better . . .