Thanks for your response. I should have said that these lettuces are indeed under cover in a polytunnel.
If you look closely at the leaves in the pic you will see they look dried out, almost crispy. In fact its hard to tell from the image but its obvious when you see them up close and touch them.
I checked the roots on these lettuce heads and they are fine and I thought that maybe we growth picked up as it has that they would grow out of it but they haven’t.
