Hi,
i have problem with corona scatter. I made ground (plane + noise mod), and use corona scatter, but my grass look strange, i dont know why. Any ideas ? 
My first thought is you probably want Align to Normal set to 1 to keep the grass upright. My second thought, is that you want to check the pivot point of the original grass and make sure it’s aligned in a way that makes sense (so that “up” for the pivot point is “up” for the grass).
It’s not only position of pivot that matters, but also its rotation. Apply reset xform on your grass patch and see if that helps.
Yep, I would try selecting the grass patch, then Hierarchy > Affect pivot only > Center to object, Align to world, and then Utilities > Reset XForm just in case, and then convert to editable poly.
grass look much better.