Will cinder over mulch slow down weeds ?

[Carey]

Mella, I think that that is the grass in our front. The stuff in our yard grows thick, very few weeds get in. The ground cover we have grows over things in big puffy mounds. We are transplanting puffs to other areas of the yard....
It has stiffish runners that will start when planted.
(it looks like some of the pictures of S. Paspalum, but we used S. paspalum for experiments at the university (from Home Depot) that grew differently than the grass we have, so I am not positive that is what we have)