I don't know what to think. I was afraid of this happening, but I finally had to check and see if the lettuce was really ok. I wanted to think so, it was getting so big, but I noticed it was getting a tad bit too tall at the bottom before the leaves start. Yep, even though we may be in the 30s this week, sometime during the growing time it got too hot and it "bolted" (grew too fast). It is bitter and will have to come out. I am heartbroken. But, the good news is that romaine grows very fast so I will seed some more either tonight or tomorrow. Just can't trust mother nature.