A new cultivar of Heuchera of hybrid origin, `Miracle`, that is characterized by its small to medium sized, ruffled, ovate-shaped leaves with unique coloration that changes throughout the growing season. In the spring and fall with cool temperatures, the leaves have red mottled centers with yellow-green margins and veins. In the summer, the leaves become greener with a silvery overlay. `Miracle` is further characterized by its mounded and compact plant habit, its hardiness at least in U.S.D.A Zones 4 to 9, its tolerance to heat and humidity, its vigorous growth habit, and its spikes of pink flowers in late spring to early summer.