I got three Siberian Elms from the trash bin after a new sidewalk was being put in. All three had very little roots. One's in the ground, making it, one's in a pot and is back budding like there's no tomorrow, and the third doesn't look like it's going to make it....this was about 3-4 wks ago. But had I a solid root ball, I would've just planted in a lg. container, not bare rooted it.
But Good Luck!