I have here a gorilla glue auto and zkittlez auto. They’re been growing outdoors and for the past three days there’s been a heatwave of 85-90 degree temps. 2/4 of my plants (1 of each strain) is experiencing gradual yellowing of topmost leaves.
Just yesterday i started noticing the yellowing of their top sugar/fan leaves along the main cola.
I had given them a dose of cal mag one day prior to the yellowing so not sure if that had anything to do with it.
They’re due for another dose of FF Tiger bloom today.
Also had a spider mite infestation last week where a bud or two was webbed but that was stamped out afaik.
It seems unusual to me that the top leaves are yellowing and steadily spreading downwards.
Not sure if I should be concerned or if it’s just some plant death cycle stuff?