What about my post 127, when to harvest the lettuce seeds. Not sure because they look so green yet.
Your idea about hanging them is a good one. I would put them in paper bags, upside down, somewhere warm and sunny and let the seeds fall when they’re ready. If the flowers have all dropped, I think it’s safe.
I discovered a few ‘surprise’ lettuce seedlings when I was scrounging around, yesterday - soon to be replanted. Red Romaine. Yay!