I have been eating lettuce for over a month but now my outside lettuce beds are all 9 inches high! I got a little smarter this year and put screens on pegs about 15 inches above the lettuce and placed lattice on top of the screens to help cool and shade it. I think I will get a few more weeks before it starts to go to seed from the heat!
With the screens even the hard rain does not mat it down. I sprinkled some Epsom salts to kill the small snails which put lots of small holes in lettuce. I also have carrots and radish mixed in the lettuce beds which will remain after the lettuce is to old! Mixed colors in the lettuce bed looks great. I bordered all the lettuce beds with onions.