Rosemary, a fragrant herb, is often mistaken for other plants like Russian sage and lavender. Identifying real rosemary involves checking for needle-like leaves with a silvery underside, a piney scent, and small blue flowers. Using the correct rosemary is crucial for cooking, as imposters can ruin the flavor of dishes.Rosemary, a fragrant herb, is often mistaken for other plants like Russian sage and lavender. Identifying real rosemary involves checking for needle-like leaves with a silvery underside, a piney scent, and small blue flowers. Using the correct rosemary is crucial for cooking, as imposters can ruin the flavor of dishes.