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Harvest seeds from June 1 1 to June 12 every year, and drill or spread the seeds on sandy loam in March of the following year. Disinfect the soil with 800 times solution of chlorothalonil or 800 times solution of potassium permanganate before sowing, and spray 50% phoxim granules evenly on the bed surface to kill underground pests. Soak the seeds in warm water at 50℃ for 2~4 hours. The drilling spacing is 30 cm and the depth is 2 cm. After covering the soil, cover the grass properly.
When sowing, seeds and fine sand can be mixed according to the ratio of 1︰3, and then evenly spread on the seedbed, covered with soil about 0.5cm thick, and then covered with grass. Sprinkle water 1 time every morning and evening after sowing to keep the soil loose and moist. Those with strong growth can bloom in the same year, but the ear should be cut off in time, because it will affect the future growth.