Thanks!
Very interesting info on growing them in alkaline conditions.
My soil when last tested had moved below 7, but initially was about 7.8.
Half or more of the trees have nice dark leaves, so it’s confusing.
The leaves on the yelllowish trees are also smaller which makes me wonder again about sun sensitivity.
I have tried light watering with 6.0 pH and it had no affect. I may experiment on 2 or more trees with different things (pH, nitrogen, iron, shade) to see what works. If I can get to it.