Have you run out of garden space and found yourself holding half-full packages of vegetable seeds? If you have extra seed, don't throw it away.
Check for Viability
According to James Romer, horticulturist with Iowa State University, there are some vegetables that will still be viable. If you have seed from previous years, examine them. For example, if the seeds are normally round in shape, but now have divots and indentations, the seed may no longer be viable.
Do a Germination Test
If you are still unsure of the seed quality, a germination test can be done. Simply take twenty seeds of the vegetable variety. Moisten a paper towel and place the seeds on it. Roll up the towel and place it in a germination chamber at 70 to 80 degrees Farenheight. What? You don't have a germination chamber? A plastic bag with a label of the vegetable variety will work just fine for your purposes.
Check the seeds after 2 or 3 days, then every day for a week or two. Divide the number of seeds germinated by the number of seeds tested. This will give you the germination percentage. If handled with care, germinated seeds may be planted in the garden if the danger of frost has past. Another alternative is to plant the seedlings in flats, pots or trays until they can be transplanted outdoors.
Unused seeds should be stored in a cool, dry location.
To help you in deciding if your vegetable seeds are viable, a chart with approximate life expectancies is provided below.
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