Lavender is completely at home in Perth's Mediterranean climate. Full sun. Very well-drained soil - waterlogging is the most common cause of death. Sandy Perth soils are ideal. Minimal watering once established. Prune by up to one-third immediately after flowering. Do not cut into bare woody stems. Dentata Frenchette is a French Lavender (Lavandula dentata) - the toothed-leaved lavender that performs particularly well in Perth, with soft mauve flowers and strongly aromatic silver-green foliage.