If you want to create textures of trees, just move to Zlín!

Masking cant be easier if trees are placed in front of an omnipresent orange walls:
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You only have to wait for cloudy weather to avoid sharp shadows and need some high resolution camera with good image quality (DSLR, Micro 4/3… definitely not a mobile phone).
Then you just erase the wall in an image editor (by selecting it’s color, creating a mask from the selection and using some additional tools like Refine Edge in PhotoShop).


Masked:

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Quick in-game test:
Clipboard 2