the hair partical rotation problem

so i wanted to make a pebble path, and this is the pebble group:

they are facing down and the down side does not have any faces
then when i add a hair partical system, check advance, from physics tab i changed it to group and inputted the group name and this is what happens:

the pebbles are facing sideways instead of downwards and the only soution is to check the rotation tab and make rotation type to none, but i want rotation of the pebbles, so what should i do?

Rotate the objects to face along the Y axis then clear their rotation with Ctrl+A