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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.
There is no known dwarfing rootstock for pecans, so they are all big! Considering that the 60 foot spacing is for 30 year old trees, a lot of folks start out with a smaller spacing, such as 30', and thin as the trees mature. Obviously, if you are planting just a couple of trees, you may be able to plant them at the 30' spacing. Uses: The nut is the most famous use of the pecan tree!