Lettuce like cold and avoid high temperature, the seeds began to germinate above 4 °C, germination temperature is 15 ~ 20 °C, 30 °C above the temperature is inhibited, therefore, except in hot season, before sowing lettuce seeds, generally do not need to deal with, In July-August, because the temperature is too high, the germination treatment is generally carried out by immersing the seeds for 2 hours and then wrapping them with wet sand cloth. Hang them in a well or in a cave or in a refrigerator at 5 to 10°C. ~4 days for low temperature germination until most seeds germinate and sow. Alternatively, seeds can be treated with phytohormones such as soaking in cytokinin 100 microliters per liter (ppm) solution for 3 minutes or soaking in gibberellin 5 microliters per liter (ppm) solution for 6 to 7 hours.
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