And contacting at least a portion of the plant the resulting dispersion process and obtain a dispersion of an aqueous solvent drug was encapsulated in the amphipathic substance, the aggregate particle size is 100nm or less, methods include the step of incorporating the plant aggregates, incorporated into drug plants.薬剤が両親媒性物質に内包された、粒径が100nm以下である会合体を水系溶媒に分散させた分散液を得る工程および得られた分散液を植物体の少なくとも一部と接触させて、会合体を植物体に取り込ませる工程を含む、薬剤を植物体に取り込ませる方法。