Zanthoxylum schinifolium aka Sichuan Pepper

Zanthoxylum schinifolium is a deciduous shrub in the Rutaceae family. Common names include peppertree and mastic-leaf prickly ash. Its native range covers central and eastern China and temperate East Asia. It also grows in Korea, Japan, and Taiwan. Wild habitats include low mountains in central and southern Japan. In Korea, it grows along roadsides.

In gardens, it reaches about 5–8 feet (1.5–2.5 metres) tall. Its spread reaches about 3–5 feet (1–1.5 metres). Plants take 10–20 years to reach their full size. The shrub has a bushy form and spiny stems. Its pinnate leaves each carry 11–21 leaflets. These leaflets have a scent, adding interest beyond their shape. The foliage turns golden yellow before falling in autumn.

Small yellow-green flowers grow in clusters during late summer. Round red fruits follow the flowers. Each fruit splits open to show glossy black seeds. The autumn leaves and bright fruits give the shrub seasonal interest. RHS suggests it for gardens that need little routine care. Its form also makes it useful as a structural plant. Plants For A Future notes its value for butterflies. It also lists woodland edges and food forests as uses.

Grow it in fertile soil that stays moist but drains well. Choose full sun or a spot with light shade. A sheltered site suits its needs. It accepts chalk, clay, loam, and sandy soils. Soil can be acidic, neutral, or alkaline. RHS rates its hardiness as H6. Plants For A Future lists USDA zones 5–9. RHS reports few usual problems with pests or diseases. Sow seeds in containers in an autumn cold frame. Summer semi-ripe cuttings need heat beneath them to root.

The fruits serve as a spice in Asian cooking. Plants For A Future lists cooked seeds as a pepper substitute. It also lists young leaves as edible, without further preparation details. That source reports no known hazards, but gives no pet-specific safety details. It records medicinal uses for the fruit wall, or pericarp. These include local numbing effects and use for digestive complaints. Its account notes that effects change with dose. These reported uses do not establish safe doses for home treatment.