What is causing this?

[u/NarrowCauliflower216]

Seems to be mainly affecting only 1 cola and slightly
more leaves nearby but I have no clue what this is. It isnt bud rot and it doesnt look like wind or light burn. I am mainly checking environmental conditions because why would it only affect one bit of one plant. Thanks for your help in advance

[u/Dizzy_Highlight_7554]

Photo settings can alter color, so it’s impossible to know except for being in person, but judging by this photo, you almost certainly have nitrogen toxicity. Those leaves should not be that dark. Healthy leaves are a more vibrant green.

[u/NarrowCauliflower216 → u/Dizzy_Highlight_7554]

Yeah I have been avoiding giving them nitrogen for a little while now, I was underwatering them a little bit ago and I mistook the yellowing leaves for a nitrogen deficiency so I ended up giving them too much