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Between the time when the bent hypocotyl (axis) grows upright and the time two closely folded cotyledons open into a horizontal position, about half of a day passes.
On a warm day when the weather is particularly fine, the cotyledons open up faster, in less than half a day.
Watch for this every day with great care.
You're more likely to see this when you sow many seeds at a time.
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You can take off a seed coat by moistening and softening it with water. But be careful not to damage the cotyledons when the seed coat sticks to an edge of the cotyledons.
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You can see a leaf bud between the cotyledons for 2 weeks.
If you sow seeds at several different times, you can see germination many times.
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