The study by Driver and Kuniyuki investigates the in vitro propagation of Paradox walnut rootstock (Juglans hindsii x J. regia) using apical and lateral meristems. They developed a specific medium, DKW, which supports multiple shoot development under optimal concentrations of 4.5 μm benzyladenine (BA) and 5 nm indolebutyric acid (IBA). The method for determining the optimal levels of constituents in tissue culture medium is discussed. The in vivo rooting of tissue culture-derived shoots was also reported. The research aimed to overcome the limitations of conventional vegetative propagation methods, which are difficult and commercially impractical. The study found that the DKW medium, with the specified concentrations of BA and IBA, significantly improved shoot multiplication and rooting, leading to the successful propagation of superior Paradox walnut rootstocks.The study by Driver and Kuniyuki investigates the in vitro propagation of Paradox walnut rootstock (Juglans hindsii x J. regia) using apical and lateral meristems. They developed a specific medium, DKW, which supports multiple shoot development under optimal concentrations of 4.5 μm benzyladenine (BA) and 5 nm indolebutyric acid (IBA). The method for determining the optimal levels of constituents in tissue culture medium is discussed. The in vivo rooting of tissue culture-derived shoots was also reported. The research aimed to overcome the limitations of conventional vegetative propagation methods, which are difficult and commercially impractical. The study found that the DKW medium, with the specified concentrations of BA and IBA, significantly improved shoot multiplication and rooting, leading to the successful propagation of superior Paradox walnut rootstocks.