How to Test Old Seeds for Viability
Every year, without fail, I buy more seed packets than I could possibly use. Fortunately, I’ve discovered that many seeds can be used a year or two (sometimes three) after you purchased them. If you have leftover seed packets from a previous season, don’t throw them away! Instead, test the seeds to see if they’re still viable. Here’s how to do it:
Instructions
Place 5-10 seeds on a damp tea towel. Fold the towel in half, covering the seeds, and place it in a storage container with an airtight lid.
Place the container in a warm location, for example on top of a refrigerator (I put mine on a heat mat).
Watch the seeds over the next couple of weeks to see if they germinate. The percentage of seeds that sprout will give you a good idea of whether the remaining seeds in the packet are worth planting.
Personally, I’ll use the seeds if at least 25% of the test batch germinates, in which case I plant four seeds (instead of the usual two) per pot or spot in the garden. If less than 25% germinate, it rarely feels worth the effort to plant them.
