Common Name:  Verbascum thapsus, Great Mullein  Tincture is prepared from fresh plant at the commencement of flowering."Mullein Oil" is prepared by placing the crushed yellow blossoms in a bottle, which is corked and allowed to stand in the sun (Cushing), or by steeping the blossoms in oil and keeping in a warm place till the oil has absorbed them.Causes & Symptoms for SBL Verbascum ThapsusVerbascum Thapsis is useful in catarrh and bronchitis