@marric Is that a leaf, or a scape with a bud on it? If it is a leaf, I would remove the leaf and throw it way - do not compost it. If it is a flower, I would let it go ahead and bloom, and then cut it off after the flower dies and also throw it away. I am not sure what the problem is, but I have had that happen on occasion - since it goes all the up the leaf/stem, I would take a guess that it might be some sort of disease, and not an injury. Once the bud starts to open up a bit, you could also just cut it and put it in a vase - turn the damaged part to the back so you can't see and still enjoy your flower. I suspect the actual flower will be fine.
