When you get a new head of lettuce, take it out of the wrapper & put it in a stainless steel bowl. I put a SCOTT Towel folded up in the bottom to stabilize it. Cover the bowl in plastic cling wrap and put it in the back of the refrigerator. It will stay fresh until the whole head is used up. My grandfather taught me this trick & it has saved me many wasted heads of lettuce. Only wash & use what you want when you need it & then put the head back in the bowl with the cling wrap. I've had heads of lettuce last a month this way.