Yesterday I noticed some foliage starting from the Dahlia tubers I planted about 6 weeks ago. And some things that aren't expected to be hardy here coming back from the roots after the unusually mild winter, Angelonia, Exacum affine (Persian violet.) Not totally sure yet, but I left the debris of last years' plants in place so I could reasonably suspect if anything placed intentionally started sprouting back up.
Also think some porterweed has survived - about 4" from where a Dahlia is sprouting. Hmm... somebody may need to move.