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With grapes pollen it needs dried out and stored in a freezer to last a year. Even then it's not as good as fresh and after a year goes down to barely viable at all. Fridge helps some. Room temperature won't stay viable for too long. Maybe a few months. What about sun dragon? 1/8 poncirus and good fruit without off flavors.
Here's a link on how to store citrus pollen.file:///C:/Users/User2/Downloads/hortsci-article-p81-1.pdfCold, dry and oxygen free. Either Nitrogen or carbon dioxide. I'll be rereading that paper to get more details. Searching youtube only gave me diretions on how to self pollinate citrus to get more fruit.