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.
Lifespan and Reproduction. Once the trees reach maturity after about 12 years (depending on the conditions under which they were cultivated), they'll begin producing seeds and start the process all over again. Pecan trees can live for an incredibly long time, with some living for well over 300 years.