Answer: Peach trees are considered self-fertile so you won't need another one for fruit set but if you plant a second peach (different variety than the one you have), both trees will set a heavier crop. Kieffer pears are considered self-fertile, but the same advice applies. If you have the room, plant one more of each and all your trees will set heavier crops. Your apple trees will not pollinate your peach or pear trees, but they will attract pollinating insects so your entire orchard should benefit. Enjoy your fruit trees.
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