'Palace Purple' Alum Root boasts deep, shining purple foliage and tolerates some dryness. Flowers are small ivory spikes in early summer. Originally selected by Brian Halliwell, curator of the herbaceous and alpine collections at Kew Gardens, England. The genus name Heuchera is in honor of the 18th-century German physician, botanist, and medicinal plant expert Johann von Heucher. 1991 Perennial Plant of the Year.