In traditional medicine, French lavender has similar medicinal properties to common lavender (L. angustifolia). It yields more essential oil than that species but is of inferior quality. In traditional herbal medicine the flowers, and the essential oil derived from them, are antiasthmatic, antiseptic, antispasmodic, digestive and expectorant. It is used internally to alleviate nausea. Externally, the essential oil is used as an antiseptic wash for wounds, ulcers, sores etc and as a relaxing oil for massage.

https://pfaf.org/user/Plant.aspx?LatinName=Lavandula+stoechas

Europe, Southwestern Europe, France