Q.zucchini goes from green to yellow
My zucchini starts out nice and green. Then when it reaches 8-10 in, it turns yellow on the ends and narrows down. I have it in a well-drained container in potting soil. The only thing I added was some 15-15-15 spray.

Downtoearthdigs
Answered on July 23, 2015
This is blossom end rot.
Here is a link with more information.
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm
https://www.gardeningknowhow.com/edible/vegetables/zucchini/solutions-for-common-problems-growing-zucchini.htm
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