There is provided a method of treating horticultural crop plants comprising the step of contacting said plants one or more times with a liquid composition, wherein said liquid composition comprises one or more cyclopropenes, and wherein said contacting is performed during a reproductive stage of said plants.本發明係提供處理園藝作物植物之方法,包括將該植物與液態組成物接觸一次或多次之步驟;其中,該液態組成物包括一種或多種環丙烯化合物(cyclopropenes),且其中該接觸係於該植物之繁殖期進行。