translate English to French: In the juvenile phase the plants produced underground rhizomes which grew plagiotropically to distances ranging from 129 to 389 cm from the parents and then became orthotropic.
Durant la phase juvénile, les plantes produisent des rhizomes souterrains à croissance plagiotropique qui croissent à une distance de 129 à 389 cm des parents, puis qui deviennent orthotropiques.