NuMex Twilight
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Numex twilight is one of the most unusual varieties of chili pepper developed at New Mexico State University (which creates all "NuMex" breeds of plant - view more NuMex varieties). It grows about 18 inches tall, and becomes covered in peppers which start out purple, then move through yellow and orange, becoming red when fully ripe, producing a rainbow effect on the green plant.
It is a hybrid based on the Thai Ornamental pepper.
[edit] See also:
List of chili pepper cultivars