<;P>;PROBLEM TO BE SOLVED: To provide a plant vitalizer having no toxicity to plants and efficiently enhancing vital force of the plants. <;P>;SOLUTION: An organic compound (except 12-30C monohydric alcohol) having &le;0.1mg solubility in 100g water at 25°;C and 0.1-300&mu;m average particle size is used as the plant vitalizer. As preferable organic compounds, silicone oil and a polyalkyl (meth)acrylate are cited. <;P>;COPYRIGHT: (C)2006,JPO&NCIPI