Abstract: The present invention relates to a synergistic composition for stimulating the production of plant material, wherein said biostimulant composition comprises at least one flavonoid ingredient selected from the group consisting of naringin, hesperidin, neohesperidin, and theaflavin, at least one essential oil compound, and at least one type of organic acid. The invention further concerns a method for stimulating the production of plant material and uses of the biostimulant composition, wherein a whole plant is topically treated with the biostimulant composition according to the invention at its surface or only certain parts (root, leaves, fruits, seeds etc.) by spray or dip application, fogging, washing or sprinkling For example, coating carioca beans prior to seeding with the biostimulant composition according to the invention results in significant increase of root length, plant height and plant diameter after a single treatment.