I’ve been trying to import my Trees from blender to unity but I can’t seem to get leaves imported properly. I’ve tried using textures mapped with a transparency layer in gimp before I map it to hundreds of planes along my mesh but when I import my mesh into unity none of the planes render correctly. I’ve even went through the process of attempting bezier curves to guide textured planes along, but still no success. I’ve been using weight paint with particle systems to apply the multiple planes to the branches on my tree mesh and still it doesn’t render correctly or transparency doesn’t apply to the planes.
your tree is 150k triangles!
I would suggest you try the Unity tree creator or optimize your blender tree.