It's time to plant radishes, zucchini, tomatoes, cucumbers, tulips, roses and daisies, but are your seeds saved in bags still good?
Here's how to check it easily.
How long do seeds remain viable?
Seed lifespan can vary greatly between species, ranging from one to several years.
However, even over time, it is possible that some of your seeds will retain their ability to germinate.
To be sure, simply carry out
a germination test.
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The foolproof tip: the germination test with paper towel
Method 1: germination test with paper towel
Soak your seeds in water for a day or night to rehydrate them;
Then, put them in a damp paper towel, and place it in a freezer bag to lock in moisture;
Put the bag in a warm, bright place;
Make sure the paper towel stays damp;
If you use a tray, put wet paper at the bottom, place the seeds on top, and cover with transparent film to retain humidity.
After 4 to 5 days, inspect the seeds to see if sprouts appear.
As soon as the seeds start to germinate, this indicates that they are viable and can be used for your seedlings.
Germination
is a clear sign that the seeds still have the capacity to grow.
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If more than half of your tested seeds germinate, this indicates that
the batch is partially viable.
You can use these seeds, but it is advisable to sow a little more densely than usual to compensate for potential non-germinations.
A success rate of 80% or higher means your seeds have excellent viability.
You can sow them with confidence, following recommended seeding densities, as the majority should germinate without issue.
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Soaking method
Another technique is to soak the seeds
in a jar of lukewarm water
(around 30°C) for a few hours.
Seeds that sink are normally still alive and ready for sowing.
This process also helps soften the outer seed coat, making it easier to germinate, especially for older seeds.