I believe these are radicchio seedlings (but I forgot to start my garden map, so they could be arugula). I just found out that radicchio is type of chicory (Cichorium intybus) and therefore an aster. And here I was thinking it's brassica, like radishes and broccoli. Oh wait, arugula is a brassica, maybe this is arugula. Holy random blogging.
I found a giant cat in the greenhouse too.