Answer: In general, all fruit trees need full sunshine and should be watered deeply once each week in your growing region. Apple trees need a second type of tree for complete pollination so unless your neighbors have trees that flower at about the same time as your apple tree, you will need to plant a second one. Some peaches are self-fruitful but all produce heavier harvests if there is a second peach tree in the area. Citrus trees are self fruitful so they should bear fruit without cross pollination. Many Asian pears are considered at least partially self-fruitful, but they, too will produce more fruits if you have a second variety in your landscape. If you make a watering basin or watering well beneath each tree by mounding up a few inches of soil all around each tree, about 12 inches from the trunk you can fill the basin, allow it to drain, then fill it a second time. This allows the water to percolate down and wet the entire root mass. You'll want to enlarge these basins as the trees grow. Usually once a week is fine for watering but the weather and your soil type will dictate how often to water. You can feed your trees each spring with a 10-10-10 fertlizer. Hope this answers all your questions.
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