I have some difficulties with labels a times, I'm not sure what takes them, but I go through periods when they travel and I find them on the ground some where else, could be kookaburras, they are destructive little buggers when they are bored, especially the young ones. So I only weed out plants that I recognise as weeds. That still has its problems eg. wild tobacco and ornamental tobacco look the same but its a start. Started using plastic knives as labels as they have a longer stem and more surface area to hold on with, I recycle them.