About Prostanthera rotundifolia R.Br.
Prostanthera rotundifolia, commonly known as round-leaved mintbush, is an erect, compact to spreading shrub. It typically reaches 0.5–3 m (1 ft 8 in – 9 ft 10 in) in height and 1.5–2.5 m (4 ft 11 in – 8 ft 2 in) in width. Its branches are aromatic, covered with short hairs and sessile glands. The leaves are egg-shaped to roughly round, measuring 3–20 mm (0.12–0.79 in) long and 3–15 mm (0.12–0.59 in) wide, borne on a petiole 2–8 mm (0.079–0.315 in) long. Flowers are arranged in leaf axils near the ends of branchlets, with 1–2 mm (0.039–0.079 in) bracteoles that fall off as the flower develops. Sepals are 4–5 mm (0.16–0.20 in) long, forming a tube 2–3.5 mm (0.079–0.138 in) long with two lobes, the upper lobe being 1.5–2 mm (0.059–0.079 in) long. Petals are purple to pinkish, 2–8 mm (0.079–0.315 in) long and form a cup-shaped tube. Flowering occurs from September to November. This species is widespread and locally common in woodland, forest, and rainforest margins, often growing in rocky areas in the eastern half of New South Wales and the southern half of Victoria. It also grows in northern and eastern Tasmania, where it is less common and listed as "vulnerable" under the Tasmanian Government Threatened Species Protection Act 1995. In horticulture, the species itself and the cultivar 'Rosea' have both earned the Royal Horticultural Society's Award of Garden Merit.
