I tried placing each grass strand origin just below it's base. The lowest part of the mesh. Or after grouping all grass together, I place the origin point at the center of the all grass meshes at it's lowest point. But both times my grass will not stick exactly on the mesh. But always above and below. I really have no clue why.
ow ow! I know I forgot to apply the location too. But leave rotation untouched ofcourse, otherwise the green arrow reset to side ways. We have to keep the green arrow pointing up.