Zucchini grow quickly, and should have harvestable fruit 4 - 8 days after flowering. If you aren't seeing fruit, (which is not an uncommon problem,) there are a few causes you can look into: https://www.gardeningknowhow.com/edible/vegetables/zucchini/zucchini-fruit-fall-off-the-plant-before-they-are-full-grown.htm
Answered on July 12, 2014
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