Leptospermum polygalifolium aka Australian Wild May

Leptospermum polygalifolium is an evergreen shrub in the myrtle family, Myrtaceae. Its native range covers eastern Australia and Lord Howe Island. On the mainland, it grows in eastern Queensland and New South Wales. Common names include Manuka tea tree and New Zealand tea plant. Despite that latter name, the sources place its origins in Australia. It grows in upland sites, heath, and dry sclerophyll forest. These sites often have poor soils over sandstone or deep sand.

The plant forms a bushy shrub with small, needle-like leaves. RHS gives a garden height and spread of 3–5 feet [1–1.5 metres]. Its shorter description gives a height near 4 feet [1.2 metres]. It takes about five to ten years to reach full size. The leaves stay on the plant through the year. In spring, many white flowers cover the shrub. Each flower measures about 0.4 inches [1 centimetre] across.

Grow it in full sun outdoors, with shelter and warmth. A south-facing or west-facing wall can provide a suitable site. It accepts clay, loam, or sand if water drains well. The soil should stay moist and be acidic to neutral. RHS rates it H3 for mild and coastal UK areas. PFAF lists USDA zones 7–10, a separate guide to hardiness. In colder settings, RHS suggests growing it under glass. Use peat-free, loam-based compost with full or bright, filtered light.

Water freely during active growth, then reduce watering in winter. RHS also advises a balanced liquid feed each month during growth. Plants grown under glass can spend the summer outside. Raise new plants from seed or summer semi-ripe cuttings. Bottom heat helps these cuttings root. Suggested uses include pots, patios, wall borders, and coastal gardens. It also suits wildlife gardens and sunny woodland edges. Its evergreen leaves provide cover beyond the spring flower display.

RHS reports few pest problems, though honey fungus can occur rarely. PFAF records the leaves as a substitute for tea. It lists no known hazards, but provides no detailed toxicity assessment. It also records no known medicinal uses. The tough wood has a close grain. People use it for stakes, poles, and fuel. PFAF does not flag the species as a weed risk.