To provide a holder for a grafted tree, with which since a uniform grip strength is obtained by forming outer peripheral channels even without limiting softness, hardness, etc., of material, a pipe and a formed layer are not overpressured, the success rate of grafting is generally increased and sound seedlings can be grown. 軟質硬質等を限定せずとも、外周溝を設けることにより、均一な握力が得られるため、導管や形成層が過圧されず、接ぎ木成功率が飛躍的に高くなるとともに、健康な苗を成育することのできる接ぎ木ホルダを提供する。 - 特許庁