The medicinal-herb garden was managed by Yakuenshi (an official in charge of managing the medicinal-herb garden) of Tenyakuryo, also it is considered that the shortfall was compensated by nenryozoyaku (medicinal herb contributed to the central government) collected from every corner of the country.
また薬園は典薬寮の薬園師が管理している他、不足分は各地から年料雑薬として納められたと考えられている。