Float Test Proves Nothing

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Dropping seeds in a glass of water to see which ones sink is a myth that refuses to die. Fresh viable seeds often float for hours because of a dry outer shell, and old dead ones can sink perfectly well, so the test tells you almost nothing about germination. The seed viability article on https://hazesativaseeds.com goes through this and a few other folk tests before landing on the only real answer, which is to germinate a sample. Firmness under gentle finger pressure is the closest thing to a useful shortcut.