It is important that lettuce be well-drained before storing. Some storage containers feature a special drainage device to raise the lettuce off the bottom and keep it from sitting in accumulated moisture. Maintain Proper Refrigerator Temperatures. Lower than recommended refrigerator temperatures could cause vegetables to freeze. Consider Vegetable Quality.
Vegetable quality affects length of storage.
Quality can vary from item to item, variety to variety and season to season. For example, a rainy growing season can cause lettuce to be brown when purchased, or brown more quickly. Sort vegetables before storage and use bruised or soft vegetables first. Discard those showing evidence of decay. Follow Length of Storage Guidelines.