Silphium – Perennial Plant, How to grow

The ancient Greek name referring to the resinous juice (Compositae). Rosin-wood. A genus of 15 species of hardy perennial plants with the typical composite flower. The sap is resinous, and the plants were introduced from eastern North America. Species cultivated S. laciniatum, the compass plant, so-called because the leaves often face north and south, 6-8 feet, flowers yellow, July to […]