Abstract: Described herein are methods of enhancing formation and/or growth of an adventitious root in a plant and/or plant tissue, and/or for promoting grafting unification, enhancing fruit size and/or reducing flowering in a plant. The method comprises contacting at least a portion of the plant and/or plant tissue with a compound having Formula I: wherein X, Y and R1-R7 are as defined herein. Further described are compositions for enhancing formation and/or growth of an adventitious root in a plant and/or plant tissue, and/or for promoting grafting unification, enhancing fruit size and/or reducing flowering in a plant, comprising the abovementioned compound and a horticulturally acceptable carrier. Novel compounds having Formula I are also described herein.