Warburgia salutaris aka Pepper Bark Tree

Warburgia salutaris, the pepperbark tree, belongs to the Canellaceae family. This evergreen comes from southern Africa, from Zimbabwe to KwaZulu-Natal. Its range also includes Mozambique. It grows in savannah woodland, coastal forest, and mountain forest. It also occurs in grassland and areas of secondary bush. Kew places it in the seasonally dry tropics.

The tree grows slowly and forms a dense, rounded crown. Garden descriptions place its height at about 26–33 feet [8–10 metres]. Broader accounts give 16–33 feet [5–10 metres] as usual. Some trees reach 66 feet [20 metres]. Its spread can reach about 26 feet [8 metres]. The simple leaves grow alternately along the stems. They are olive green and have a sharp, bitter taste. Small green flowers grow where leaves join the stems. Each flower has ten yellow-green petals. The round berries start dark green and turn purple when ripe.

Give this tree full sun and soil that drains well. It suits sandy or loamy soil with plenty of compost. It prefers moist ground but withstands some drought once established. Acid to neutral soil suits it best. The sources list USDA zones 10–12 and warn that frost harms it. Its slow growth means a hedge takes time to fill. It responds well to pruning and can regrow after coppicing. Sow fresh seed soon, since it loses viability fast. Cuttings offer another way to raise plants.

Grow pepperbark as a specimen, hedge, or shade tree. Farmers also use it to shade coffee, banana, and cocoa crops. Its bark supplies resin and tannins. The wood is aromatic and oily, and workers can polish it well. It darkens when exposed to air but lacks durability. Leaves add a hot, bitter flavour to soups and curries. People also use them to make tea. PFAF lists the inner bark as edible too. Both reference sites report no known hazards. This does not establish safety for every use or dose.

Pepperbark has a long history in southern African traditional medicine. People use its bark, roots, and stems for many ailments. These include coughs, colds, stomach pain, diarrhoea, and malaria. These records describe traditional uses, not proof of effective treatment. Harvesting for medicine places heavy pressure on wild trees. Farming, settlement, and timber cutting also reduce its habitat. Useful Tropical Plants reports an Endangered listing from the 2011 IUCN assessment. It identifies bark, stem, and root collection as the main direct threat.