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Pecan trees can grow over 100 feet (30.5 m) tall, and they have root systems that stretch deep and wide. They need plenty of space, whether you're planting them in your yard or in an orchard. When you're choosing a spot, take the following into consideration: Make sure there are no buildings or other trees nearby.
Pecan trees require a lot of water, and the nut size will be stunted without adequate supply. For the first two to three years, young trees need 10 to 15 gallons of water per week, from either rainfall or supplemental irrigation. Take a soil test to determine levels of fertilizer use.