I have 2 geranuims and they have always kept well. For the past couple of weeks they have fur all over them and not looking healthy at all. The branches are all soggy. I pruned them right back and put bug killer on them as well as slug pellets but since xmas they are all furry again. I can see tiny new growth but it does not seem to be getting very far. What can I do (if anything). I always thought you could not kill geranuims.