Disclaimer: This post was originally posted by Hero Member, John. This user is located in Zone 5. This was originally posted on August 15, 2013.
Here's a tip from an article I wrote several years ago:
"Some crops produce ethylene gas (a gas that promotes ripening) while others are damaged by it. Grapes, green onions, melons, mushrooms, peaches, pears, tomatoes, peppers and watermelon, among others, produce ethylene gas. On the other hand, crops such as asparagus, broccoli, cabbage, carrots, cucumbers, eggplant, parsley, peas and squash are damaged by ethylene gas. Lettuce begins to decay almost immediately when exposed to even low amounts of ethylene gas. So remember to always store separately in your refrigerator."