Philadelphus purpurascens

Philadelphus purpurascens is a deciduous shrub in the Hydrangeaceae family. Its common name is purple-bud mock orange. It comes from western China, though sources differ on its range. Kew lists northwestern Sichuan, while Plants For A Future also lists Yunnan. It grows in mountain scrub, mixed woods, and thickets. Records also place it on mountain slopes. These habitats lie about 7,200–11,500 feet [2,200–3,500 metres] above sea level.

In gardens, it reaches about 8–13 feet [2.5–4 metres] tall. Its spread is about 5–8 feet [1.5–2.5 metres]. The RHS gives five to ten years to reach full size. The plant has an upright frame, but its branches spread and arch. This gives it a less rigid outline as it grows. Its dark green leaves have an ovate, or egg-shaped, outline. The leaves fall for winter, leaving the branch structure bare.

Summer brings clusters of white flowers with a sweet scent. Purple calyces contrast with the white blooms. These coloured flower parts help set this species apart. The flowers and arching stems suit loose, informal planting. The RHS suggests cottage gardens, wildlife gardens, and coastal sites. It also lists flower beds and borders as suitable settings. Plants For A Future suggests woodland edges and places with dappled shade. The shrub can form an informal hedge or screen.

Give it sun or partial shade and soil that drains well. The RHS recommends soil with a moderate level of fertility. It accepts chalk, clay, loam, and sand. Acid, neutral, and alkaline soils all fall within its listed range. Moist soil suits it, provided excess water can drain away. The RHS rates its hardiness as H6. Plants For A Future lists USDA zones 5–9. The RHS accepts both open and sheltered sites. Softwood or hardwood cuttings offer ways to raise more plants.

Aphids can attack this shrub, and powdery mildew may occur. Honey fungus is another possible problem, though the RHS calls it rare. Plants For A Future records no known food or medicinal uses. It also lists no known hazards; this is not proof of safety. Its leaves contain saponins and make a lather when crushed with water. The source describes this as a mild cleaner for skin and clothes. It works better on dirt than on oil.