Choose only healthy, unblemished vegetables for storage. Handle them carefully, and store larger quantities in mesh bags so they get adequate air circulation. Do not wash vegetables before storing them. Also, do not stack mesh bags of vegetables; instead, store vegetables in a single layer.
Store most vegetables in a cold, moist environment of between 45 to 50 degrees Fahrenheit. Make sure there is plenty of air is available in the storage space. Root cellars or basements provide the best conditions. A cold, moist environment is best for beans, peas, cauliflower, broccoli, lettuce, cabbage, beets, carrots, potatoes, corn and spinach.
Provide a cool spot of approximately 50 degrees Fahrenheit for tomatoes, cucumbers, peppers, squash and watermelons. Locate an area out of direct sunlight in the kitchen, pantry or unused room in the house. Make certain heating and air-conditioning vents are not directed at the vegetables.
Place onions, garlic, leeks and shallots in a cold, dry spot. The vegetable drawer of the refrigerator will provide the correct conditions.