Garden pests and critters were the worse in the summer of 2013 that I have ever seen. Everything chewed on anything green. Grasshoppers, sometimes four different species at the same time, would be notching the edges of iris leaves when I would be weeding. I resorted to comet sprinkled on them every day. This kept them from being eaten by bugs and even the rabbits stopped eating my other plants when I sprinkled comet on them. I don't know if it was the bleach in the comet or the grit or both. Everything had white powder on it but for a buck a can it was the best deterrent without killing critters. I have about decided that I may have to resort to killing critters if it comes down to them or my irises.