Checking Seed ViabilityMost vegetable seeds basically need two things in order to germinate - moisture and warmth (there are some lettuces that germinate better when there's some light as well). We can easily replicate those conditions and spark the seed into germination. Here's what you will need:
- Paper towels
- Misting bottle filled with clean water
- Old seeds to check
- A Ziploc baggie
- A warm location
Moisten a Paper TowelFirst, lay a paper towel on a flat, clean surface and moisten it with the misting bottle. The paper towel doesn't need to be sopping wet, just throughly moistened.
Add Your Seeds and Wrap Them UpPlace five to ten old seeds in the center of the moistened paper towel and fold it to form a small square pouch. In the pictures above I am checking some old Lemon Cucumber seeds I had left over from a few years ago. You can see that some of the seeds are sitting on top of one another, but it's best to separate them so they aren't touching.
Place Seed Pouch In a BaggieWith the moistened seed pouch completed the next thing you need to do is place the pouch inside the sandwich baggie and seal it up. Once the baggie is sealed you simply place it in a warm location (at least 75°F - 80°F). Now all that's left is to wait.
Checking the Old Seeds for Signs of GerminationDifferent seeds will have different lengths of germination. Check the seed packet you are using to determine how long it takes your particular seeds to germinate. If you don't have the seed packet to go by, here's a handy seed germination chart. After a couple days begin checking your seeds. They should begin swelling in size some. This means they have started the germination process. After several days you should begin seeing tiny shoots appear from the seeds. This means they are germinating and are good to use! If after a couple weeks you don't see any signs of germination then you can assume the seed is a dud.
Determining Germination RatesIf you check seed viability of ten seeds and only five germinate then you have a germination rate of about 50%. That means you will need to double the amount you sow in order to have enough plants. In my opinion, if you check ten seeds and only two or three germinate it is a good idea to get new seeds unless it's a rare or vintage variety of seed. It's not worth the risk with that low of a germination rate. It is also a good idea to perform this check right before you plan to sow the seeds - whether it's indoors or out. Once the seeds begin germinating they need to be sowed or they may end up going bad. Performing a seed viability check is a good way to check to see if your old seeds will germinate and also pre-germinate them to lessen the amount of time it takes them to germinate at planting time.
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