Answer: I'm sorry -- I think I'm the one who misread your earlier question! The only thing I can think of is that you aren't seeing the flower when it's open - they only receptive to pollen for 4-6 hours, and if they don't get pollinated within that window, they close and never open again. A truly unopened blossom will look fresh and firm, and one that has closed has a brownish, limp or curled end. Sometimes, even if a blossom does get pollinated, it can abort due to overfeeding with nitrogen-rich fertilizer. Pumpkin vines grow rapidly at the begining of the season, and then slow toward mid-summer when blossoms appear, and growth is more balanced. But excess nitrogen fertilizer pushes them on, putting young fruit at risk. You might also look for damage from cucumber beetles. They sometimes chew right through the unopened blossoms to feast on the inner parts. I hope this sheds some light, but if none of these possibilities seems to fit your situation, let us know. Best of luck!
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