The best way to dry green onion seeds is to allow them to dry on the plant for as long as possible, as this is where they are naturally dried.
Here's a breakdown of how to dry your green onion seeds successfully:
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Leave them on the plant: The easiest and most effective method is to leave the seed heads on the green onion plant until they are fully mature and dry. This ensures the seeds have adequate time to develop and dry naturally.
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Check for maturity: The seeds are ready when the seed heads become dry and brittle. The seeds themselves will likely be black and hard.
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Harvest carefully: Once dry, carefully harvest the seed heads. Be gentle as you remove the seed heads to prevent the seeds from scattering.
It is worth noting that onion seeds are considered heavy and are not easily blown away by the wind.