 Rabbi Lefkowitz also allowed etrog growers to take cuttings from the tree to grow entire orchards of etrogim certified as kosher ("mehudar") by the Chazon Ish.The tree itself defies natural laws, as etrog trees usually grow from the tree itself or from a cutting, not from seeds, and those planted from seeds usually don't yield fruit.Moreover, etrog trees typically produce for five to seven years, whereas Rabbi Lefkowitz's tree produced hundreds of clean, high-quality etrogim for over half a century.