PROBLEM TO BE SOLVED: To provide a plant monitoring device, a plant monitoring method, and a program for monitoring the condition of a plant and the soil in which the plant grows. SOLUTION: A plant monitoring device 100 uses frequency-related information calculated based on vibration measured through soil, and information indicating a soil condition and frequency-related information are associated with each soil condition. Using the soil condition estimation unit 200, which estimates the soil condition by referring to the soil condition estimation information, and the growth-related information indicating the growth of the plant calculated based on the vibration of the plant, the plant above the ground surface of the plant It has a plant state estimation unit 300 that estimates the state of the plant by referring to the plant state estimation information associated with each state of the plant above the ground surface of the plant with the information indicating the state and the growth-related information. [Selection diagram] Fig. 1【課題】植物及びその植物を生育する土壌の状態を監視する植物監視装置、植物監視方法、及びプログラムを提供する。【解決手段】植物監視装置１００は、土壌を介して計測された振動に基づいて算出した周波数関連情報を用いて、土壌の状態を示す情報と周波数関連情報とが土壌の状態ごとに関連付けられた土壌状態推定情報を参照し、土壌の状態を推定する、土壌状態推定部２００と、植物の振動に基づいて算出した植物の成長を表す成長関連情報を用いて、植物の地表面以上の植物の状態を示す情報と成長関連情報とが植物の地表面以上の植物の状態ごとに関連付けられた植物状態推定情報を参照し、植物の状態を推定する、植物状態推定部３００と、を有する。【選択図】図１
