A researched TAFE plant identification study record for Lavandula dentata. “French Lavender” is the persistent Australian common name, while “Fringed” or “Toothed Lavender” describes its foliage more directly.

Identification

This aromatic, spreading shrub is woody at the base. Narrow grey-green leaves have regularly rounded teeth or scallops along the margins—an important distinction from the entire-margined leaves of several other lavenders. Slender stalks carry dense purple-blue flower spikes topped by coloured sterile bracts. The cultivated var. candicans is notably silvery and hairy, whereas var. dentata is usually greener.

Distribution and habitat

Kew records a broad native range from the western Mediterranean through parts of north-eastern Africa to Jordan and the Arabian Peninsula. In nature it occurs in Mediterranean scrub, rocky mountain habitats and open forest understorey. It has also naturalised outside that range, including in Western Australia.

Cultivation

Plant in full sun with excellent drainage. Once established it is drought tolerant, but performance and flowering improve when severe water stress is avoided. Trim after a major flowering period to limit woody, open growth, without cutting so hard that no active shoots remain. Bees visit the flowers, which can also be used as cut material.

Safety and terminology

Lavender oil and plant contact can cause dermatitis in susceptible people. Common names vary internationally: do not rely on “French lavender” alone when identifying a specimen, because that name is also applied to other Lavandula species in different countries.