I have been trying to establish a patch of native Bluebells under my plum and apple trees, but something keeps digging them up. I know that in part it is my cat, but she is not solely to blame. I cover them over with wire crates to stop her digging until the grass has grown over them, but I still keep losing them. I have tried for at least 3 years now, and keep failing. Does anyone have any tips, as I will try once more, as I think they will look lovely naturalized under my fruit trees?