You might look at this thread Harrow Delight Pear. The fact it took was not unusual because Harrow delight has old home as part of its genetics which is half the cross of the most famous pear Rootstock grown today old home x farmingdale ohxf . When grafting Harrow delight expect 100% takes. You can take that further and next year use an interstem of Harrow delight to graft nearly any other pear on your trees.
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