PROBLEM TO BE SOLVED: To provide a blueberry tree, capable of achieving the improvement of rooting rate of grafting, enabling the production of a large amount of seedlings in a short period, not limited by the soil conditions in the cultivating area, and also capable of widely cultivating the tree even in a low temperature area. SOLUTION: This method for producing the improved blueberry tree is provided by grafting a new head of the tree of the High bush family blueberry as a scion on a stock of a young tree of around 1 year of the Rabbit eye family blueberry, and growing.