from male to female flowers for normal fruit development.
That said, University of Delaware Extension research on summer squash fruiting disorders points out that some varieties can set fruit without pollination, so flower type is a useful starting clue rather than an absolute rule for every plant.
Heat can reduce fruit set without creating one exact cutoff
Summer heat does more than make gardeners uncomfortable. When temperatures climb into the 90s °F during the day and stay in the 70s °F at night, cucurbits like zucchini can shift toward producing
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