Rosemary Essential Oil 100% Pure Natural, Bulk Wholesale For DIY, Skin, Soap, Candle, Blends, and Diffuser. Rosemary Essential Oil Rosemary essential oil is a highly aromatic oil that is extracted from the leaves of the rosemary plant. The oil has a fresh, herbaceous aroma that is both invigorating and uplifting, making it a popular choice in aromatherapy. Blends Well With Lavender Lemon Cedarwood Lavandin Flashpoint 110° F Extraction Method Steam Distilled Botanical Name Rosmarinus officinalis.