Toothache tree (Zanthoxylum nitidum) | seeds, 10 pcs.

• Latin name: Zanthoxylum nitidum
• Danish names: Toothbrush tree (unofficial), Asian pepper tree
• English names: Shiny-leaf prickly ash, toothache tree

Zanthoxylum nitidum is an aromatic small tree or large shrub from Southeast Asia, where it occurs naturally in China, Thailand, Vietnam, and surrounding areas. The species belongs to the same genus as Sichuan pepper (Zanthoxylum piperitum and Z. armatum), but differs in its glossy, dark green leaves, its compact growth, and a distinct citrus-like aroma in both the leaves, bark, and fruits.

The leaves are pinnate and highly aromatic when crushed. The branches often bear thorns, which is characteristic of the genus. In the spring, small, discreet flowers develop, followed by fruits that open upon maturity to reveal black seeds. It is primarily the fruit husks and the bark that contain the aromatic and flavoring compounds.

Cultivation and requirements:

Zanthoxylum nitidum thrives best in full sun to light partial shade and prefers a well-drained but moisture-retentive soil. It requires more warmth than Z. piperitum and Z. armatum and is therefore best suited for cultivation in pots or sheltered microclimates in Denmark.

The plant tolerates only light frost and should be overwintered frost-free, especially when young. During the summer, it thrives outdoors in a warm spot, where sun and heat promote the development of aroma in the leaves. It tolerates pruning well and can be kept compact.

Cultivation from seed:

The seeds are sown in a well-drained soil mix and covered lightly. A short cold stratification can improve germination. Afterwards, the seeds germinate at 20–25 °C over several weeks. Young plants grow steadily and quickly develop their characteristic glossy leaves and thorns.

Utility:

Zanthoxylum nitidum has a long tradition of use in Asian folk medicine, especially the bark and roots, which have been used against toothache and inflammatory conditions – hence the name toothache tree.

The plant is also used culinarily in certain regions, where leaves and fruit husks are used as a spice with a citrusy, slightly numbing flavor, related to Sichuan pepper, but often more intense and raw in expression.

Zanthoxylum nitidum is an exciting choice for the curious plant enthusiast – an exotic and aromatic pepper tree that combines ornamental value, fragrance, and traditional use in one single plant.