In this paper, we analyze the skill characteristics and extension system of wild vegetable farm groups. As such, we conduct a case study of a wild vegetable farm group in the Mamurogawa agricultural cooperative, and focus on related group activities skill extension. As wild vegetable farms are required specific skills, skill extension is related to small improvement activities in wild vegetable farm groups. Furthermore, the cultivation skill of wild vegetables is a difficult technique of this extension. However, a skill is shared and extended among members of similar qualities.