More garden geometry. I'm not responsible for this instance. 
Discussion
you can take the seeds and drop outside and liberate it from the greenhouse
It's a volunteer. I have lettuce growing all over the place. The greenhouse is actually just a modified hoop frame for vining things & shade cloth in late summer, so they are pretty free to wander. This one is right in my zucchini so I think I'm going to need to pick it before those take over.
ahh volunteers! they are just like nostriches..
if you are in a hot climate you could grow those lettuces during winter as well ?
we do that here in central Texas.
my garden is pretty crowded usually. i let them do land race. whoever wins is the stronger one!
Your lettuce has bolted. Might not taste good anymore. Are you seeding it out?
Only this one has, but very perfectly.
what do you call this?
? Lettuce
Red lettuce? Not familiar with this type.