yeah you should still be good to grow now, not to late in the season yet, they will just bud when they are a little bit smaller then they would be. and i hate the paper towel method personally, I just put seeds in a seed starting thing (you can use an empty egg carton if you don't have any at your disposal) just put dirt in it and transplant after the second set of leaves. broken roots should be fine though just give it a little extra attention. if not you haven't lost to much time so just try again. best of luck.