According to the old people, it is bad and unlucky to grow pumpkins at home. I think this is superstition, but I want to know why there is such a saying.

This is a superstitious statement, which can also be called folklore, a statement, but I don't know whether it is accurate or not. Pumpkin is also called pumpkin, which is homophonic "cowardice" In other words, in the south, the pronunciation of "pumpkin" is similar to "sad". Pumpkins stay at home, and life is sad and unlucky.