Bush Bean (Phaseolus vulgaris 'Topcrop')

While *Phaseolus vulgaris* (the common bean) is native to the Americas (specifically, Central and South America), the ‘Topcrop’ cultivar of bush bean is a developed variety, meaning it was bred and selected for specific traits. Therefore, it doesn’t have a “native region” in the same way a wild plant does.

However, we can infer a likely *breeding and development* location based on its history:

* **United States:** Most bean cultivars, including ‘Topcrop’, widely grown in the US, were likely developed in the US, often by agricultural universities or seed companies.

Therefore, it is highly probable that the **United States** is where ‘Topcrop’ was developed. More specific information about the actual breeding location would require deeper investigation into the seed catalogs and agricultural research of the early to mid 20th century when this variety was introduced.