Fan-trained Peach - Keeps open habit. Fruit produced on yo branches so if trying to espalier, you will be keeping branches that are older and fruit production is reduced. Remove all branches sticking out;
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While you may not be able to grow citrus trees in the cooler regions of the United States, there are a number of cold hardy fruit trees suited to USDA zone 4 and even zone Pears are ideal. Learn more about zone 4 pear trees in this article.
Apple trees that you plant early next spring may start yielding fruit in three to four years. But they'll be giving joy almost immediately. Planting apple trees with your children can be especially rewarding.