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If you want the tree to produce fruiting branches low to the ground, you can prune it to knee height and cut back the side branches to one or two buds. This will direct the tree's energy to producing low branches at the cuts you made. On the other hand, you can lop off the bottom branches if you'd prefer the tree not to have branches low to the ground. Many fruit tree growers use a diluted solution of half white latex paint, half water to paint the tree trunk to act as a sunscreen. If you live in a region with very strong sun, like the Southwestern US, using this method will protect your tree from sun damage. It's important to weed the area around the tree as it grows to protect the roots and keep the tree growing healthy and strong. Pull the weeds by hand, rather than using an herbicide. Keeping the soil constantly wet is not necessary, and can lead to the roots rotting. Let the rainwater your tree. If a week has passed with no rainfall, water it thoroughly, then let it dry out again.
Decide how to prune. Protect the tree from sunburn. Control weeds. Don't overwater.