Terra Flora,as mentioned in the link I gave you, does this: That is why i mentioned the layering of Terra Flora is important vs those mentioned alternative forests addons otherwise terra flora will be overwritten unless placed higher in the scenery_packs.ini or the forest options of SFD Global and/or X-Europe are disabled. There will also be conflicts if you have other forest type addons like those offered in X-Europe and SFD Global etc.
I am also saying that any trees that are part of an addon like trees in an airport scenery are not changed by Terra Flora as they are trees used by the Developer of that addon and can only be changed by the Developer. I am also confirming that trees in XPlane are crosses unlike in P3D.
I am saying that the True Earth addons already have trees from Terra Flora.
