If you have leftover flower seeds from last year (or even new ones from this season), and want to check their viability, here are a few simple steps. All you need is a paper towel and a plastic baggie. In fact, you can use this same method to get those seeds-a-sprouting before you get them planted outside.
To complete this seed germination test:
- Dampen the paper towel. Spread it out on a flat surface.
- Space out ten seeds in a row on the towel.
- Roll the seeds up inside the paper towel. Press (lightly) to make sure the seeds are in contact with the damp towel.
- Place the towel inside a plastic baggie and seal it up.
- Now wait! Check the seeds every few days for germination by gently unrolling the paper towel. If they’ve sprouted, you’re good! If not, roll the seeds back up and return to the baggie.
If the seeds germinate, count how many have sprouted and multiply by 10 to get the viability rate. For example, if 7 of 10 sprout, you have a 70% viability rate. If less than 5 of the 10 seeds sprout (under 50% germination rate), you may want to plant more than you think you’ll need to increase your rate of success or discard them completely.
Repeat for each type of seed you’re testing. Be sure to use a different paper towel for each. Sweet Alyssum on one paper towel, your Purple Coneflowers on another. Be sure to label the baggies if you’re testing many of them!