Zones: 5 to 10
Size: 18 to 48" tall clump
Growth Rate: Moderate
Large yellow flowers from June to September. Tolerates poor soil and low moisture once established. Should be divided every 2 years. Tend to be short-lived perennials but will self-sow.
Published in Brit. Fl. Gard. (Sweet) 2: 175 in 1826.
Native to southeastern US.
'Grandiflora' means large-flowered.