zucchini fruit staying small

Question

I have two zucchini plants in a large pot that I have been growing in a greenhouse. They are producing fruit now, but when the zucchini get 2-3″ long they stop growing. They have been this size for the past six days.

Answer 1

It is a pollination problem. In the greenhouse, they likely do not have any pollinators. You will need to hand pollinate. This article will help:
https://www.gardeningknowhow.com/edible/vegetables/squash/pollinate-squash-by-hand.htm