Hatch chile Chile de árbol, Spanish for tree chili is a small and potent Mexican chili pepper. These chilis are about 5 to 7.5 cm, 2.0 to 3.0 in. long, and 0.65 to 1 cm, 0.26 to 0.39 in in diameter. The peppers start out green and turn a bright red color as they mature.
