PROBLEM TO BE SOLVED: To provide a plant circadian rhythm regulating agent, and a more simple and convenient plant circadian rhythm regulating method.SOLUTION: A plant circadian rhythm regulating agent contains a heterocycle-containing compound represented by the general formula (1) or an agriculturally acceptable salt, hydrate or solvate thereof as an active ingredient.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】植物概日リズム調整剤、及びより簡便な植物概日リズム調整方法を提供すること。【解決手段】一般式(1)で示される複素環含有化合物、又はその農学的に許容される塩、水和物若しくは溶媒和物を有効成分として含む、植物概日リズム調整剤【選択図】なし