Knowledgebase
zucchini plant #874528
Asked June 24, 2024, 7:28 PM EDT
Stearns County Minnesota
Expert Response
https://extension.unh.edu/blog/2018/06/zucchini-plants-flowering-not-producing-fruit
Also, pollination of squash depends on bees. If something disrupts bee activity (heat, rain), pollination can be incomplete:
https://blog-fruit-vegetable-ipm.extension.umn.edu/2021/07/vegetables-not-yielding-well-blame-heat.html
It is common for early fruit to get blossom end rot, which is what you are describing. Hopefully, later fruit will be unaffected. Read here:
https://yardandgarden.extension.iastate.edu/faq/fruit-my-zucchini-squash-began-grow-quickly-turned-brown-and-rotted-why