Are they the same species? Is there a difference in the microclimate - i.e. are your trees partially sheltered? Particularly from the sky on cold nights. I assume you have fertilized more than the trees in nature? What about watering? Is there any form of drought in your area that would have stressed the trees in nature? Just some things to think about.
I will have to do some species research and try to determine if these are the same species.
I assumed the large trees were the native species but I have not ID them yet.
And since they are in a straight line it suggests perhaps they were planted.
Good project for the weekend.
As far as fert, yes my trees were hit heavy with calcium, phosphate, carbon etc, as I experimented with Eden & Apical this summer so it very well could be a nutrition difference.
My Larix larcinia just started turning last week and I’m in 4a. The mild weather and the fact that trees in containers do not act the same as trees in nature can both be reasons. Trees in nature don’t get fooled into leafing out too early in spring or not allowing their chlorophyll to be absorbed in fall. And then you have what type of larch do you have Japanese, American or European? All could be reasons but I think it’s the very mild weather that my trees changed color so late. My Arakawa just started to turn color two days ago.