Cusick's Giant Hyssop

Agastache cusickii is a species of flowering plant in the mint family known by the common name Cusick's giant hyssop. It is native to the northwestern United States from eastern Oregon and central Nevada to Idaho and Montana.

This perennial herb grows 10 to 20 centimeters tall from a woody taproot and caudex. Some of the stems spread horizontally underground. It has leaves covered in fine hairs and the fruits are nutlets. The spikelike inflorescence bears flowers with purple-tipped sepals and white corollas each about a centimeter long with protruding stamens. Blooming occurs in June through August.