I made a mistake. I threw a few seeds in a (biodegradable carton type) small container thinking, as I've done before, I would kill them. BUT to my surprise, my little seedlings are flourishing. YAY! Anyway, I have many lettuce seedlings and I will need to transplant them to a very large container soon and wanted to know if there were suggestions on how to do that with minimal disturbance to the roots. The container will only have the lettuce and its just one kind of lettuce. Help... Rear and middle cups 2nd from right.