camellia hedge yellowish, swollen leaves

Question

I have just trimmed my camellia hedge and found a cluster of leaves that are yellowish and swollen 3/4 times the normal size. No sign of bugs! I found 4 separate examples of this leaf issue.

Answer 1

Without a picture, it is hard to say what it is. I would guess it is either leaf galls, which can be caused by fungus, bacteria or very small pests. If it is leaf galls, they are unsightly, but harmless. More info:
https://www.gardeningknowhow.com/plant-problems/environmental/treating-leaf-gall-on-plants.htm

It may also be a condition called witches' broom. This is typically caused by a disease. This article has more information:
https://www.gardeningknowhow.com/ornamental/trees/tgen/witches-broom-disease.htm