- Author: Carmen Kappos
Have you ever found an old seed packet and wondered what to do with it? Seeds deteriorate as they age which can give variable results. Fortunately there is a simple way to see if seeds will germinate. You can use this easy rolled paper towel test to check for seed viability.
This seed viability test takes seven to ten days and will give you an idea of how well your seeds will germinate.
- Lay a moistened paper towel flat
- Place a row of ten seeds starting along one edge
- Roll up loosely
- Carefully place the damp towel in a plastic bag and seal it to hold in the moisture
- Place the bag in a warm spot (On top of the refrigerator is ideal as that area is generally a consistent seventy degrees)
- Check every couple of days: if the paper towel is drying out, gently mist with water, but as the bag is sealed, it should not dry out
- At the end of seven days, unroll the towel and see how many seeds have sprouted. (Some seed will need ten days to two weeks to germinate. The seed packet may have this information.)
The recommendations are that if less than seven out of ten (seventy percent) seeds have sprouted, then you are probably better off getting fresh seed. If seventy to ninety percent have sprouted, it should be fine to plant but sow the seed a little thicker than you normally would. If all the seeds have sprouted, plant as you normally would.
If it is time to plant, you can use the sprouted seeds if handled carefully. Often the roots have grown into the damp towel. If so, cut the paper towel between seeds and plant with a little bit of toweling. That way, the roots and growing tip will not be damaged. If not grown into the towel, handle carefully by the top so not to damage the root, planting right away so that it does not dry out.
I was surprised to see that five- and seven-year-old flower seeds that I tested had germinated. Keep in mind that fresh seed usually gives the best results. Vegetable seeds should be no more than two to three years old with some exceptions. Onion, chive, parsnip and parsley seeds are recommended to be stored for only one year.