https://www.aphis.usda.gov/traveling-wi ... nd-borders
Travelers may bring commercially canned fruits and vegetables into the United States as long as you declare them on your U.S. Customs form. Home-canned products are not allowed entry because canning practices can vary and may not remove all pest and disease risks.
Specific guidance for travelers entering the United States at Canadian land borders with this category of commodities can be found here.