How Long To Grow Jalapeno From Seed. Make sure you’re planting at the right time before you attempt to grow out your seeds. Begin to harden off jalapeño seedlings about 10 days before transplanting outdoors.
Slide open the vents on the lid for proper airflow. In contrast, jalapeno pepper plants will not produce an abundance of fruit when the temperature is over 90 f. Follow the seed packet for optimal planting depth.
Like other pepper varieties, it is best to start jalapeno pepper plants indoors.
Sow seeds indoors six to eight weeks or more before the last frost date for your area. So, it stands to reason that putting jalapeño. It takes 80 days to mature from seed to harvest; Start seeds indoors about 6 weeks.