Leaf Color changes depending on over or under watering

[PastryBaker]

Yes, I watched a video on Youtube and saw this interesting take on overwatering vs under watering with how the leaves look.
It said that if a tree is being under watered the leaf will begin to turn yellow on the edges and the yellowing going inward.
And if it is being over watered the leaf will start to yellow in the middle and the yellowing going outward.

Any thoughts? Mainly because many times people will say that a tree is either being over or under watered, but still a guessing game.

 

[WIlliam_Butler_Yeets]

I would take that with a grain of salt. Over/under watering a tree is still causing dehydration, and the mechanism is the same. To my understanding, whether the roots are drowned or dried doesn't actually matter. With underwatering the leaves dry out because there's not enough water to absorb. With overwatering the roots are compromised and become unable to take up water, even if it is present. But the result of either situation is the same drying effect on the tree, whatever the cause, the tree can't get enough water.

 

[Wires_Guy_wires]

Yeah, the signs can be ambiguous, especially with conifers that take months to turn. Either way, root issues express themselves in yellowing, and that's a sign to act a week, or a month ago.
The differences can be so minute that it mostly comes down to memory about watering anyways.

 

[Glaucus]

Overwatering can cause issues with nutrient uptake. There's a whole bunch of nutrient deficiencies that theoretically, one can ID. For tomato, capsicum/chili/bell pepper, or cannabis, they have pictures or drawings. But in practice, with a species that's different, one has to know the species, the deficiencies and how they look, and confirm it with a lab test.

I wonder a lot about overwatering. Specially for climates where there is a lot of rain during winter, when plants are dormant, and plants need way less water.
I am starting to think it is more of a thing about overpotting a plant.
Overpotting and overwatering is definitely a thing. But it depends on so many other factors. And every species is different.The weather is never the same. And a pot depends on the potting mix.

The key thing is to know how your species of interest looks when it is really healthy. That way, when it looks different, you will start to notice.