Round Leaf Mint Bush (Prostanthera rotundifolia): Australian Native with Aromatic Foliage

Overview

Round leaf mint bush (Prostanthera rotundifolia) is a compact, evergreen shrub native to southeastern Australia. Its small, rounded, intensely mint-scented leaves and masses of purple flowers make it a standout in Mediterranean-climate gardens and containers.

Botanical Description

Dense, rounded shrub 1–2 m tall and wide. Leaves are orbicular, 5–10 mm diameter, glossy dark green, highly aromatic (mint-eucalyptus). Flowers are tubular, 1–1.5 cm long, purple to violet, borne profusely in spring, often covering the foliage.

Taxonomy

Family:	Lamiaceae (lay-mee-AY-see-ee)
Genus:	Prostanthera (pros-TAN-ther-uh)
Species:	rotundifolia (ro-tun-dih-FOH-lee-uh)

Growing Conditions

• Light: Full sun to part shade.
• Soil: Well-drained, slightly acidic; dislikes alkalinity.
• Water: Moderate; drought-tolerant once established.
• Hardiness: USDA zones 9–10; marginal in 8b with protection.

Garden Uses

Hedges, screens, containers, sensory gardens. Responds well to pruning. Attracts native bees and birds. In cold climates, grow in large pots and overwinter in a cool greenhouse.

Notes

The genus Prostanthera (mint bushes) is endemic to Australia. Many species are highly ornamental. P. rotundifolia is among the most widely cultivated. Prune after flowering to maintain density.