How do you keep lettuce from rotting in the refrigerator?

Eat it A.S.A.P.  If you wait a week, to eat it, then it will be no good.

Cut the stem out of it, and then run cold water through it (turned upside down). Dry it thoroughly and then wrap it in paper towels.  Eat it within three-four days, because it's very perishable.  Don't wrap it in plastic or foil.

Use it up quickly. Lettuce has a very short life--and you have to use it before it turns to green slime. 

I put mine in one of the ziploc bags with as much air pushed out before sealing the zipper as I can manage. It lasts about a week longer that way. But don't expect it last any longer than that--it's not supposed to. 

Keep it dry and in the bin with paper towels underneath it to absorb moisture. Use it within about 2-3 days from purchase, it never lasts more than that. Usually from the time of picking from the field to the store it has started to decline anyway.

wrap it in cling wrap or an airtight container .cold and airtight .

keep your fridge on cold!

 Picked or NOT Picked  stored or not  LETTUCE will eventually ROT  the stability of lettuce  diminishes  with TIME  same as human beings and other  animals  AGE

the LIFE span of a lettuce PLANT is only 130 days

 head   lettuce MATURES in 45- 55 days  Romain matures in 75-85 days

and crisp-head  MATURES in 70 - 100 days

Lettuce is primarily WATER  and does NOT store well

the TYPE of LETTUCE is the variable

1-  consume  the lettuce in a timely manner  within  7-10 days of purchase or harvesting

according to TASTE of HOME  ..

..LOOSE LEAF  lettuce  can last 7 -10 days in the refrigerator , properly stored

HEAD LETTUCE    left intact  and  " UNWASHED " can last 1-3 weeks

  according to Web page MOMABLES

1-seperate the lettuce leaves place in large bowl or spinner

2-add 1 cup of vinegar and fill with water let rest a few minutes

3- then  drain and  rinse with water

4- Spin dry or shake off excess water

5-  lay out on paper or dish   towels to AIR DRY

6- place in a gallon size zip lock bag with a  paper towel and refrigerate

a Individual would have to do their own  repeat of this method from  MOMABLES  TEST-ABILITY  to  draw a conclusion of  such action directed action  ADDED  time and how much time to the stability of lettuce as in be their own  DETECTIVE  rather than just accepting a CLAIM  cause  person X said so 

  it is my practice to purchase  only the QUANTITY  of produce  i intend or plan to use that WEEK  ( 7 day period ) and for " Bagged " lettuce  check the BEST if USED BY date  for example  a loose  or romaine lettuce

coverings with polethin,,,,  

Put it in the crisper at the high humidity setting (assuming you have that option). Don't expect the freshness to last forever. I'd still try to eat it ASAP.

just use it up before it rots