Most of the time around here (Middle TN) we don't find seng where we find the Sassafras seedlings and saplings showing up.
That is uaually a indication that we are getting a bit to high and dry for seng.
Muscidine Vines, Sassafras, and those hard green briars (we call em saw briers) are all usually growing just a bit too high elevation wise for seng.
As we start down a hollow hunting for seng, we often go thru that higher area where Muscidine, Sassafras and saw briers show up and then a bit lower we start seeing ferns including maidenhair, bainberry, and that american hog peanut, and then we are getting right for seng.
As we are hunting up a hollow, when we start seeing Sassafras & Muscidine, that is usually a sign it's about time to stop looking in that direction and go back down the hill.
Often when they select cut or clear cut a hollow around here it will grow up with saplings of all kinds and blackberry briars and we do find seng growing mixed in with briars in that case. But the old hard green briars we call saw briars are usually a sign you are getting too high/dry for seng.
5prong - it is interesting that sassafras is a good sign for you but a bad sign for me. What State are you hunting in ?
Here in Middle TN where we hunt the elevation normally ranges from around 1100-1000' on the ridge tops to down around 600-700' in the hollow bottoms. We find most of our seng below the 750' level but occasinally on a north facing hill or head of a hollow that slopes to the north we do find it growing quite a bit higher than that.
TNhunter