Brown Jalapeno-(Capsicum annuum)-. The Brown Jalapeno is an extra large mild Jalapeno that ripened brown and has a smoky sweet flavor with mild heat. The smokiness is very subtle in the background. The Brown Jalapeno peppers are over an inch in width and average 4 to 6 inches long. They are ideal for stuffing, roasting and sauces. The Brown Jalapeno chile plants need staking because of the amount and weight of the chilies. They grow over 4 feet tall.