How to avoid particle data being stored in blend file to make it smaller? I'm working with particles (for grass or leaves).
The problem is the blend file is very huge when it contains a lot of particles.

Is it possible to stop blender storing particle data to make the file smaller?
In your particle system tab there is a minimized subsection called Cache.  If you open that up and check the Disk Cache checkbox and Bake, that will cause your particle data to be stashed in a directory called blendcache_something/ and not in your .blend file.