The suitable temperature for pepper seeds to germinate is 25 ~ 30℃, and it takes 5 ~ 7 days to germinate. When the temperature is lower than 15℃ or higher than 35℃, the seeds will not germinate. The seedling stage requires high temperature, 25 ~ 30 degrees during the day and 15 ~ 18 degrees at night is the best. Seedlings are not tolerant of low temperature, so pay attention to cold protection. It is usually planted in April and May in the north.