I threw away a lot of lettuce. For years. I would buy a head of romaine on Sunday. By Wednesday it was brown at the edges. By Friday it was a science experiment. I thought this was just how lettuce worked.

It is not how lettuce works. It is how moisture works. Lettuce rots because water sits on the leaves. A paper towel fixes this in about ten seconds.

Why Your Lettuce Gets Slimy So Fast

The inside of a container or plastic bag traps humidity. Condensation forms. Water droplets settle on the leaves. In three or four days, those wet spots become brown spots. Then they become slime.

Grocery stores spray their produce with water to keep it looking crisp. That water becomes your enemy once the lettuce is in your fridge.

The Paper Towel Method

1. Wash and dry your lettuce first. A salad spinner is worth owning — I resisted buying one for years out of stubbornness and regret the time wasted.
2. Line the bottom of a storage container or bag with a dry paper towel.
3. Add your dry lettuce on top.
4. Place another paper towel on top before sealing.
5. Store in the crisper drawer. Replace the paper towels every three or four days if they become damp.

The paper towels absorb ambient moisture before it can settle on the leaves. They act like a dehumidifier at a scale that matters for a head of romaine.

What Works for Different Types of Greens

Whole heads of lettuce last longest. Keep them intact and only tear off leaves as you need them. A whole head of romaine with a paper towel in the bag lasts me nearly two weeks now.

Pre-cut bagged lettuce is trickier because it is already bruised from processing. Toss a paper towel into the bag immediately after opening. It buys you maybe an extra five days. Better than nothing.

Spinach and arugula are more delicate. Paper towels still help but expect a week max. These greens just have a shorter fridge life and that is biology, not a failure of technique.

The Mistake I Made the First Time

I put wet lettuce directly on a paper towel and sealed the container. The paper towel became soaked in an hour. Now I had wet lettuce wrapped in wet paper — worse than before. Dry your greens first. The paper towel manages residual moisture, not standing water.