Seed viability

Here is a list of the number of years vegetable seeds remain viable, provided they have been stored in cool, dark and dry conditions. This is important because older seeds will have low germination rates.
VegetableShelf life
Onion, parsley, parsnip1 year
Corn, leek, pepper2 years
Bean, broccoli, carrot, celery, kohlrabi, pea, spinach3 years
Beet, Brussels sprouts, cabbage, cauliflower, eggplant, kale, pumpkin, rutabaga, squash, Swiss chard, tomato, turnip, watermelon4 years
Cantaloupe, cucumber, radish5 years
Lettuce6 years