Answer: It's difficult to say whether the seed is at fault, but there is a variety of zucchini called 'Roly-Poly' that's round rather than long. Perhaps that's what you purchased. As with all summer squash, cross-pollination can occur but the results will only be evident if you save seed from this year's fruit and plant them next year. There's no telling what you may end up with!
Q&A Library Searching Tips