If you seed source is pre-soaked (for processing out the saponins), the germination rate will be very poor. When I tried this, the seeds has "sprouted" in just a day, but those were just old dry sprouts long dead..
I did a germination test of a lot of my old seed, and included some quinoa that I got from the bulk bins at the grocery store -- it had a very good germination rate. I haven't planted any outside yet, but it looks like it will grow.
I found it sprouts well, and grew well last year. However seems most quinoa comes from ultra high elevations with completely different climates than most of us. I hear you can find lower elevation adapted strains, they may produce much better.
Assuming that you have an ample supply of seeds, lay them out on a paper towel on a 10x10 grid. Keep them moist until they sprout. You will quickly know the germination rate. If there are 100 seeds on the grid and 83 germinate, the rate is 83%.
Now, I seldom do this. I seldom have the seeds to waste, and I can figure all this out after I plant 5he seeds in my garden.
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