French lavender/Spanish lavender. Grown in England since mid 16th century. Aromatic foliage and flowers. Daytime scent used by Greeks, Romans and Arabs in ancient times as antiseptic and toiletry herb.  Was actually used as antiseptic for swabbing wounds in World War I. Many think that silver Mediterranean plants are ideal for drought but it depends on the British weather as it does not like heavy frost or winter wet so not always hardy. Clip off flowers but only prune back in the Spring not in the Autumn. Possibly introduced by Romans as growing in Mediterranean but some believe it originated in India. In medieval times a shirt washed in lavender water would supposedly be free of lice as long as the scent persisted. As an arometherapy oil it is used to relax.