If it works for you that is awesome. Unfortunately our mulberry tree has never had any seedlings sprout up from the fallen fruit, so apparently just planting them will not work for seeds from our tree. I went into my mulberry planting project expecting failure because many of the things I have read said that if the tree didn't have a bunch of seedlings under it every year, then it was probably a graft that would not produce viable seed. 90 days later I planted four seeds, and in two weeks from planting one had sprouted and now a little over three months later I have a second seedling. I don't know... Maybe ours is some kind of variety that needs a really good stratification period.
Very interesting on the graft bit. I have seeds from both white and black mulberries that I'm using for my experiment. Seeds were purchased online, and after being in a moist paper towel at room temperature for two weeks, one of my black mulberries has actually sprouted. I put the others in the refrigerator for a little while to see what they do. I'm quite pleased to have a sprout so far, as I have no idea if these were cold stratified or not. It seems like most of the seeds I've been testing (not mulberries) are quite fussy about being planted before they sprout and establish a root.