JalapeÃ±o Peppers. Key Facts. The majority of the U.S. commercial jalapeÃ±o supply is grown in New Mexico, Texas, and California but many small farms throughout the southwest grow peppers for sale to local markets. JalapeÃ±os are also imported to the U.S. and imported peppers were the source of a large Salmonella Saintpaul outbreak in 2008.