Oenothera berlandierii 'Twilight' is an upright, herbaceous perennial that has mid-green foliage with a distinctive purple-bronze central marking, most pronounced in young growth. The flowers are large, clear pink and produced throughout summer in large quantities. A striking form of evening primrose. New growth emerging in the spring from winter dormancy appears as a deep plum color. During the warmer months, foliage changes to mid-green as it begins a prolific display of large, pale pink flowers lasting through the warmer months. Tolerates extreme cold as well as dry.