PROBLEM TO BE SOLVED: To provide a culture medium for plant cultivation which can shorten the period to germination of plants, and to provide a plant culture device and a plant cultivation method.SOLUTION: The invention provides a culture medium for plant cultivation using a fiber aggregate 12 consisting of a fiber 13 comprising a thermoplastic resin (A) having a solubility parameter of 11.5(cal/cm3)1/2 or more to 14.0(cal/cm3)1/2 or less as well as a plant culture device 1 and a plant cultivation method using the same.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】植物の発芽までの期間を短縮させることができる植物栽培用培地、並びに植物栽培装置および植物栽培方法を提供する。【解決手段】溶解度パラメーターが11.5(cal/cm3)1/2以上14.0(cal/cm3)1/2以下である熱可塑性樹脂(A)を含む繊維13からなる繊維集合体12を用いた植物栽培用培地、並びにそれを用いた植物栽培装置1および植物栽培方法を提供する。【選択図】図1