One of the most popular chiles in Mexico! The green, 3″-6″ poblano is most often stuffed with cheese or meat for chiles rellenos and the dark, reddish-brown dried ancho is used in a variety of sauces, such as the traditional “mole poblano”. 1,000-2,000 Scoville Heat Units (mild).. Mature Size: 18″ x 12″. Full Sun (6+ Hours).