Yellow Crook Neck Squash
My squash are coming on fast but are hollow and soft, dented horizontally. No bugs or other signs of problems. The plants look beautiful and the blossoms are large. What could be going on?
Certified GKH Gardening Expert
A number of things could be causing this. For instance, it could be due to extremely rapid growth, usually in periods of abundant moisture after drier growing conditions. Likewise, it could be attributed to squash rot from a calcium deficiency. Pests can also be an issue, such as squash borers which are difficult to see as they usually burrow within the stems.
Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm