Hick said:if it molds, it has collected moisture. Moisture is pollens enemy. Try putting a few grains of rice or a desicant package in an airtight vile with your collected pollen. "I" have even add approximately 50% flour. It "stretches" the supply, and helps keep it "DRY".
Then you can freeze it. But it will only remain viable for a single defrosting. So if you want to use it multiple times, store it in multiple packages
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