High temperatures can cause squash plants to produce too few male flowers, to it may be that there were not enough to pollinate your female blooms.
More info here https://www.rhs.org.uk/advice/profile?PID=676
Here's a Canadian website which may also help:
http://magazine.cog.ca/pumpkin-passion/
i seemed to have a lot of male flowers, many more then female,
between the two plants i would say i had at least 12 male flowers open every morning, nice big bright and orange
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High temperatures can cause squash plants to produce too few male flowers, to it may be that there were not enough to pollinate your female blooms.
More info here https://www.rhs.org.uk/advice/profile?PID=676
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Here's a Canadian website which may also help:
http://magazine.cog.ca/pumpkin-passion/
i seemed to have a lot of male flowers, many more then female,
between the two plants i would say i had at least 12 male flowers open every morning, nice big bright and orange