Q.Crookneck Squash
My squash plants are huge, and there are many large flowers, but the squash don’t get any larger than 3 or 4 inches and don’t mature. The fruits form quickly, but then stop growing. This is the first time I have grown them. They are in a sunny location and I water them often.
Certified GKH Gardening Expert
It is a pollination issue. These articles will help:
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm
https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/pollinate-squash-by-hand.htm