Originally Posted by Owp
Light could be one of the variables, but I used to grow water lettuce in my koi pond. Sometimes it was beautiful, and sometimes it was just raggity. I assumed that the koi were just eating the roots off of it, but I would perk back up for awhile and then look raggity again. I never did find a cause. I did notice the new baby plants that grew from the runners always looked better than the older plants.