If you have short hair, it’s a lot better for maintenance for a lot of reasons. None less so than the fact that you really don’t need to wash it, or at least not like you would other hair-types.
The shorter the hair strand, the less distance the natural oils have to travel. This means that your hair will not appear as greasy as someone with longer hair. Again, longer hair tends to be a lot flatter. This means the oil travels far more easily.