Prostanthera phylicifolia, commonly known as Spiked Mint-Bush, is an evergreen shrub native to the sclerophyll forests and coastal heathlands of Eastern Australia. This species typically grows to a height of 0.5–2 m (1 ft 8 in – 6 ft 7 in) and features four-ridged, slightly aromatic branches. The leaves are narrow egg-shaped to oval, measuring 5–15 mm (0.20–0.59 in) long and 1.5–4 mm (0.059–0.157 in) wide, attached to a petiole up to 1 mm (0.039 in) long. The white or pale lilac flowers are showy, with purple and yellow spots, and are arranged near the ends of the branchlets. Flowering occurs mainly in spring and summer, adding ornamental value to the garden.

The Spiked Mint-Bush is valued for its aromatic foliage and attractive, tubular flowers that attract pollinators such as bees. It is used in cultivation for border planting, as a feature shrub, and in native plant gardens. Prostanthera phylicifolia thrives in full sun or part shade and prefers well-drained soils, though it can tolerate medium or slow-draining soils with adequate care. Regular pruning helps maintain its shape and encourages denser growth. While it generally requires medium to high amounts of water, established plants can tolerate short dry periods. It is relatively low maintenance but can be susceptible to root rot in poorly drained soils and may be affected by foliar diseases in humid conditions.CC BY-SA 4.0