Lavandin grosso essential oil. Lavandin Grosso: Lavandula hybrida or x intermedia. This is a hybrid developed by crossing true lavender with spike lavender which grows wild in areas where true lavender is cultivated or grows wild. The essential oil's aroma is powdery, sweet, floral and herbaceous. Its use is the same as for Lavender and is effective as an inhalation for colds, sinusitis and other respiratory problems. May clear headaches, good for muscular stiffness. Blends well with bergamot, clary sage and lemon. Flash point: 151°F.