Salvia trijuga San Ye Shu Wei Cao
A small, perennial species, rare in cultivation, that is native to the hillsides, streamsides, grasslands, thickets, forests and valleys of Sichuan, Xizang and Yunnan in China (where it is used medicinally). Produces dainty clumps of grey-green foliage and upright spikes of beautiful, deep violet flowers, streaked with white. Flowering August to September. Height 30 cm. Moisture retentive, very well-drained soil in part shade.