There is provided a composition comprising an oil medium, wherein particles are suspended in said oil medium, wherein said particles comprise cyclopropene and molecular encapsulating agent, and wherein said particles have median size, as measured by the largest dimension, of 50 micrometer or less. Also provided arc a method of making such a composition and a method of treating plants by contact with such a composition.本發明提供一種包括油介質之組成物，其中將粒子懸浮於該油介質中，其中該粒子包括環丙烯以及分子包膠劑，其中該粒子以最大可度量尺寸來量測時，具有50微米或更小之中位數大小。本發明也提供製造該組成物的方法以及藉由接觸該組成物而處理植物之方法。
