Some very great informative postings here, thanks everyone. I would like to add one thing that I do here, that I did not notice in all the previous postings here...
I make up my cell builder 4 days ahead of the grafting, and it contains one frame with a good portion of eggs. In 4 days, I go in and remove that frame and destroy all the queen cells and give it to another hive. Then I insert my grafted cell bars in it's place. This gives me a hopelessly queenless cell builder with a full force of nurse bees actively producing royal jelly! I get much larger well built cells this way and I think it's because the nurse bees are actively producing royal jelly in the starter when I insert the cell bar.



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), priming makes sense. But if you don't have any on hand, would double grafting not only "prime" the cups, but also accomplish the goal of getting the hives into "cell building mode" as you described above?














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