PROBLEM TO BE SOLVED: To obtain a plant growth regulating agent having good workability, environment-friendly, scarcely having toxicity so as to be safe, capable of producing an excellent dwarfing effect by surely preventing a plant body from unproductively growing, and capable of improving quality of horticultural and farm products. SOLUTION: The plant growth regulating agent is given by dispersing or dissolving cinnamic acid in an aqueous medium to have a high concentration. A method for dwarfing a plant seedling comprises using the plant growth regulating agent in an amount of 0.0001-0.2 pt.wt. as the cinnamic acid based on 100 pts.wt. of culture soil in which the plant seedling is cultivated. COPYRIGHT: (C)2005,JPO&NCIPI
