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.
Growth and Seed Production. The pecan tree grows approximately 35 inches per year on sandy loam soil. The tree begins to produce viable seeds when it reaches 20 years of age. Maximum seed production begins at 75 to 225 years of age. A mature tree will produce and average of 100 lbs. of seeds per year.