PURPOSE: A manufacturing method of grafting of Solanaceae crops using black nightshade is provided to reduce continuous cropping obstacles such as insect attacks with Solanaceae crops and black nightshade. CONSTITUTION: A manufacturing method of grafting of Solanaceae crops using black nightshade includes a step for producing Solanaceae crops by collecting black nightshade in state of nature. The Solanaceae crops include Capsicum annuum, and tomato, etc. The Solanaceae crops are used for grafting of black nightshade.