A plant protection method according to one embodiment protects a plant 20 from insects. This plant protection method has an attachment step for attaching at least one net 10 comprising a thermoplastic resin and including an insecticidal component to a plant in a manner such that the net forms a protective structure 30A having a three-dimensional structure.本發明之一實施形態之植物之保護方法係保護植物20免受害蟲之傷害的植物之保護方法。該保護方法具有將至少一片熱塑性樹脂製並且包含殺蟲活性成分之網10以由網形成具有立體結構之保護用結構體30A之方式安裝於植物之安裝步驟。