Here is a file with the pollen storage data (excluding Stuart’s data on the 48 hour style persistence).
We pollinated 3 plants in the common garden that were still flowering. Each plant had 3 treatments of stored Echinacea pollen; ambient temperature, frozen, and refrigerated. The frozen and refrigerated pollen caused shriveling, the ambient temperature treatment did not.
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Interesting. Did you use pollen of different ages?