'Firefly' is a strikingly two-toned coreopsis with single blooms of bright lemon yellow surrounding hot red centers. This plant blooms prolifically from June through September. Fine threads of green foliage grow in a short, dense mound. 'Firefly' has good mildew resistance and is extremely cold hardy from zones 5-10. Mature height of 'Firefly' is 10" tall. Plant in full to part sun in well drained soil in the front of the perennial border.