I have some vegetables and fruits in my balcony. All are in pots. Unfortunately, almost all of them start to develop issues in their leaves. Yellowing, having grey dead spots, etc. Here are some photos I took :
Plant 1 (Start Fruit) :
Plant 2 (Egg plant) :
Plant 3 (Bitter gourd) :
I also have orange, a small variety of orange (I don't know the English name for it) and grapes. They are doing well! Any idea why this is happening?