Basil turning yellow

Question

My potted basil plants are turning yellow. They are getting enough water. Suggestions please.
I have lemon balm in the same spot . (You can see the yellowed edges of the leaf in the second pic).

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Answer 1

They look like they need fertilizer, particularly iron. And do they get 6 hours of sun a day?

Here are more causes of yellowing leaves:

https://www.gardeningknowhow.com/edible/herbs/basil/yellow-leaves-on-basil.htm