Meaning: This sentence connects the harvest season with pumpkins. It means that the time of year when crops are gathered from the fields, particularly in autumn, is also the time when pumpkins are abundant and commonly used.
Choice of Words: "Harvest" refers to the process of gathering crops from the fields after they have grown. "Time" is a period or duration. "Pumpkin" is the large, orange fruit often associated with Halloween and autumn.