It sort of looks like what a bad infestation of pill bugs will leave as telltale evidence. I see little rolls of dirt (or whatever) like this a lot in my side yard garden. It is very damp due to heavy shade and I have been fighting pill bugs there ever since I bought this house. I would put some Spectracide (which works) out to kill them but my 16 yr. old little rat terrier is very sensitive to insecticides. When she passes on, I will go after them diligently, however. Until then, I just put up with them as their lifestyle/eating habits add some nutrients back to the soil. You say you are watering daily, you may be keeping the soil so damp you are encouraging them? But if you have pill bugs bad in an area, you will see the rolled-up little crustaceans under/in flower pots, on dead wood and rotting vegetation and such.