Looks like some kind of bulb growth, for sure. Did you put any Dutch iris in the pot maybe? Doesn't seem quite the right time for them, but some are early and maybe they got tricked. What I can see reminds me of those in appearance. All the muscaris have popped up here, but unless you've got a new kind, this doesn't fit that. Do you remember if you had bulbs that would be waking up in the fall rather than waiting 'til spring? That might narrow it down.
