1. Exorcise ghosts and evil spirits: In ancient medicine in China, black beans were considered as mysterious objects that could absorb metaphysics, so they could exorcise ghosts and evil spirits.
2. Blessing: In some cultures, black beans are regarded as mascots, so scattering them in the yard can pray for good luck and happiness.
3. Nutritional value: Black bean is a nutritious food, rich in protein, vitamins and minerals. Therefore, in some cultures, black beans are scattered in the yard to provide nutrition for the land, make the land more fertile and harvest more crops.
It should be noted that different cultures have different understandings and uses of black beans, so the specific meaning should be understood according to local culture and tradition.