More ash trees: https://3dsky.org/collection/shared/5251731 

Deciduous tree Ash-tree 10.5 meters high.

A trunk with branches and foliage are separate objects. If necessary you can remove the leaves partially (randomly select subobjects in the ribbon panel) or completely (for the bare tree as in the preview) or draw VertexColorMap.
In the scene there are four cubes with various materials for the ash tree according to the seasons:
– summer;
– autumn;
– summer autumn;
– late autumn.
For the last two draw vertex maps on channels 2 and 3 respectively. To do this apply the VertexPaint modifier to the foliage fill the model with black and a white brush about 2000 mm in size draw areas where there will be green (for the summer-autumn option) or red (for the late autumn option) leaves. Added screenshots to the archive. Similarly you can draw a whitewash of a tree at the base. I could not save the file with the drawn maps because the file weight increases quite a lot.

Done in GrowFX2.

Polys (Editable Mesh) – 2 448 005