hello,
I made my own trees in Blender and I want to put them into Unity3D. So I went to the terrain-editor and choosed my trees. But when I put them on to the ground, there are no leaves around my bark 
And the trees are “laying” the ground. If i want to change the rotation, there is only a grey field, so I can’t change anything.
Don’t use the mesh for the terrain trees. Create a prefab of the tree, make sure it looks good, and use that.