How do you get the hard green shell off a walnut?

To remove the hard green shell of a walnut, first, wait until the nuts are fully mature and the outer husk begins to split, indicating it's ready to be harvested. Use a sharp knife or a nutcracker to carefully cut through the husk, and then pull it away from the shell. Be prepared for the husk to stain your hands, so wearing gloves can help. Once the husk is removed, you can then let the walnuts dry before cracking the inner shell.