Serena Williams hits 157 consecutive weeks at No.1 this week, passing Martina Navratilova for the second-longest streak at No.1 in WTA history.
Answers.comÂ® is making the world better one answer at a time. A pecan tree can start producing pecans anywhere from 4 to 10 years if they are grafted. Ungrafted trees can take 10 to 15 years before producing pecans.
1 A pecan tree could damage buildings or smaller trees with falling branches as it grows bigger.  In an orchard, plant the trees at least 60 feet (18.3 m) apart. Allow for approximately 35 feet (10.67 m) spacing between each pecan tree that you plant.