I have a transplanted "lamb ears"(stachys byzantina) I went to check on it, its doing well- as I was pulling some dead leaves, the base had a deep hole-It spooked me, didnt want my hand bit by something, then I saw a whole bunch of rolly polly bugs-I hear they eat dead leaves-so, are they doing good for my plant, or are they killing it??? The amount of them creeps me out...