Buphthalmum -

The most common species in cultivation. It is a compact, clump-forming perennial that typically grows 18 to 24 inches tall and features willow-like, dark green leaves.

Native to northern Italy, this species is noted for its high phenolic content in its roots and shoots. buphthalmum

A species specific to the island of Sardinia. Growing & Care Instructions The most common species in cultivation

According to care guides from EarthOne and RHS Gardening , here are the optimal conditions for growing Buphthalmum salicifolium : buphthalmum