Hortensia Primeur

i have just cut out a branch of my Hortensia. The leaves were curled and as you can see in the photo they had crispy and discolored edges. The remainder of the plant seems to be fine. What could this be and do I need to take any precautions to prevent this from happening to the rest of the plant, and potentially my other Hortentias.


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I have checked all 5 other plants and none of them have anything like this so hopefully it’s just a one off.