Where can I find these amazing models in this screenshot?

NiallBTboy

L1: Registered
Jan 2, 2015
9
1
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This is the screenshot in discussion.

I am using this image for a scenic influence on a new map I am hoping to have published towards the end of this month- However, I cannot find out how they have achieved these amazing orange/red trees.
I have attempted to find custom models online; to no success.

I have gone through all the models in my hammer (tf & other files), yet cannot find it to no avail. I am presuming they have got a custom white tree model, then coloured in the leaves different? But even so, it doesn't appear like there is any leave models within hammer itself. Slightly confused, but *any* help would be greatly appreciated.

Thanks in advance!
~ Niall