A plant cultivating method includes: applying a voltage of 4 kV or more and 15 kV or less to a culture material (120) not including phosphorus at a frequency of 0 Hz or more and 200 kHz or less； sowing a seed of a plant (150) in the culture material (120) after the applying； and adding phosphorus to the culture material within 7 days from germination of the seed of the plant (150).
