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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.
Time Frame. A grafted pecan tree can produce a small crop as soon as two years after its grafting, although it will typically take closer to five years to mature enough to produce a large crop. Some pecan trees may take 10 to 12 years to move beyond vegetative growth into fruiting maturity.ecan trees can grow to 70 feet tall have trunk diameters of 6 feet at full maturity. Trees can be spaced as close as 30 to 40 feet apart until they are about 15 years old, at which point they should be thinned. At 30 to 40 years old, pecan trees grow to a width of closer to 60 feet. Kennith Ponder/iStock/Getty Images.