Plantain herb cultivation method

The invention discloses a plantain herb cultivation method and belongs to the technical field of agriculture cultivation. The plantain herb cultivation method comprises steps of (1) building a greenhouse, (2) broadcasting, (3) applying fertilizer and irrigating, (4) harvesting seeds and (5) harvesting herb, wherein seedlings are thinned when plantain herbs grow to 3 to 5cm high; the seedlings are sowed in lines and have a seedling interval of 20 to 25cm; fertilizer is first applied in November; 1500kg of light man and livestock liquid dung fertilizer is applied to each mu; fertilizer is applied for the second time in the next first ten-days of January; nitrogen is controlled and phosphor, potassium and boric fertilizer are supplied; during plantain herb heading period, drainage ditches are dredged in time; sunshine duration is controlled for the greenhouse in summer; and the internal temperature of the greenhouse is controlled to be lower than 32 DEG C. Germination capacity of plantain herb seeds can be improved; the drainage ditches are dredged in time during the plantain herb heading period, so root corrosion due to water accumulation can be prevented; and plantain herb heading quality can be guaranteed and the plantain herb cultivation method has great practicality.