Wash the green beans thoroughly under cold running water. Trim both ends and remove any damaged beans. Cut into 1 to 2-inch pieces, or leave whole if preferred.
Wash Mason jars, lids, and bands in hot soapy water. Keep jars hot until ready to fill.
Pack the prepared green beans tightly into the hot jars, leaving 1 inch headspace.
Add 1 teaspoon canning salt to each quart jar (or ½ teaspoon per pint), if using.
Pour boiling water over the beans, maintaining 1 inch headspace.
Remove air bubbles using a bubble remover or plastic spatula. Add more boiling water if necessary.
Wipe the jar rims with a clean damp cloth. Place the lids on the jars and tighten the bands until fingertip tight.
Place the jars into the prepared pressure canner according to the manufacturer's instructions.
Process:
Pint Jars: 20 minutes
Quart Jars: 25 minutes
Use:
10 PSI for weighted-gauge canners
11 PSI for dial-gauge canners
Adjust for altitude if necessary.
Allow the canner to cool naturally until pressure reaches zero before opening.
Remove jars and let cool undisturbed for 12–24 hours.
Check the seals, remove the screw bands, label the jars, and store in a cool, dark pantry.