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

Five young ash trees 5.3, 6, 6.4, 7.4 and 8.2 meters high.
There are two versions of the material in the scene - summer and autumn.
To get a "bare" tree, delete polygons with ID 5,8,9.

Model at the origin
Pivots at the base of the trunks
There are no groups
Normals are not turned inside out
X-form done
Textures and materials have the correct names, without Cyrillic
No extra geometry
The archive files max (177 MB), fbx and jpeg (36 MB)
Number of triangles (Editable Mesh) - 3 379 525
Number of points - 3 110 117