80 days. A very distinctive flavored hot pepper. This Serrano is not for the faint of taste but is one of the most popular along the Mexico border. The plant grows 30 to 36 inches tall and bears thin-walled, 2 inch long by 1/2 inch wide, slender fruits that turn red when reaching maturity. Prolific and ever-bearing. Scoville units: 5,000 - 23,000.