The present invention relates to a method of introducing a florigen into a cell of a shoot apical tissue of a plant using a cell-penetrating peptide. More specifically, the present invention relates to a method of introducing a florigen into a cell of a shoot apical tissue of a plant, the method including the step of bringing a solution for florigen introduction containing a florigen and a cell-penetrating peptide in one solvent into contact with a shoot apical tissue of a plant. The present invention also relates to an agent for introducing a florigen into a cell of a shoot apical tissue of a plant, including a florigen and a cell-penetrating peptide, and to a kit for introducing a florigen into a cell of a shoot apical tissue of a plant.
