Zanthoxylum piperitum

This plant is a small tree or shrub.

It grows sharp thorns on its branches. The tree has yellow-green flowers in the spring.

In the fall, the fruit turns bright red. The fruit bursts open to show black seeds. People use the leaves and fruit for food. They add them to fish or soup. They even make sweet rice cakes with them.

This plant has a very strong taste.

Japanese pepper is a small tree or shrub.

It grows in Japan, Korea, and China. This plant has sharp thorns on its branches. It also has leaves with bumpy edges. In spring, it grows small yellow-green flowers. The flowers belong to male or female plants. People can eat the male flowers. The female flowers turn into small berries.

In autumn, these berries turn bright red. They burst open to scatter black seeds.

People use this plant to make food taste special. In Japan, they use the ground berries on grilled eel. They also use young leaves in soups and salads. Some people even make sweet rice cakes with the flavor. In Korea, people use the dried fruit in fish stew. They also use the leaves in pancakes or fritters. The plant has a very strong taste. This comes from special oils and parts called sanshool and sanshoamide. Even the wood is used to make tools for grinding food.

Japanese pepper is a special kind of small tree or shrub.

It belongs to the citrus and rue family, which is the same family as lemons. This plant is native to Japan, Korea, and the Chinese mainland. In Japan, people call it sanshō. In Korea, it is known as chopi. It is a very important plant for flavoring food in these countries. It is also a close relative of the Sichuan pepper found in China.

This plant has a very interesting way of growing. In the spring, between April and May, it grows small yellow-green flowers. The plant is dioecious, which means there are separate male and female plants. People can actually eat the male flowers, which are called hana-sanshō. The female flowers grow into small berries or peppercorns about 5mm wide. In the autumn, these berries turn bright red and burst open. This action scatters the black seeds inside to grow new plants.

Many different kinds of this plant exist. One variety is called Z. piperitum var. inerme Makino. This version is special because it is nearly thornless. People grow this version a lot for making food. Another type is called the hairy chopi. The plant also has sharp thorns on its branches. It has leaves with bumpy edges that grow in pairs. These leaves are a home for the citrus butterfly.

People use every part of this plant in many ways. In Japan, the ground berries are used on broiled eel. They are also in a spice mix called shichimi. Young leaves are used in soups and salads. In Korea, dried chopi fruit is put in loach soup or fish stew. People even use the leaves to make pancakes or fritters. Some people even use the fruit to catch fish. The fruit is poisonous to small fish in ponds.

The strong taste of the plant comes from special parts. These parts are called sanshool and sanshoamide. It also has aromatic oils like geraniol and citral. In Japan, the thick wood is used to make a tool called a suribachi pestle. This tool helps grind food. Some people even make sweet rice cakes with the flavor. It is a plant that connects nature to many delicious meals.

Zanthoxylum piperitum is a deciduous, aromatic shrub or small tree. It belongs to the Rutaceae family, which includes citrus plants. This species is native to Japan, Korea, and parts of the Chinese mainland. In Japan, it is commonly known as sanshō. In Korea, it is referred to as chopi. It is a close relative of the Chinese Sichuan pepper. Both plants belong to the same genus, Zanthoxylum.

The plant has a specific biological cycle. Between April and May, it produces yellow-green flower clusters. This species is dioecious, meaning male and female flowers grow on separate plants. The male flowers can be eaten as hana-sanshō. The female flowers develop into small berries or peppercorns about 5mm wide. During autumn, these berries turn a bright scarlet color. They eventually burst open to scatter black seeds.

Several distinct varieties of this plant exist. One variety is Z. piperitum var. inerme Makino, which is known as the thornless variety. Because it lacks sharp thorns, it is widely cultivated for commercial use. Another form is Z. piperitum f. pubsescens, which is called hairy chopi in Korea. The standard plant typically features branches with sharp thorns. It also has odd-epinnately compound leaves with serrated margins.

History and cultivation are deeply tied to specific regions. In Japan, Wakayama Prefecture produces 80% of the domestic supply. Aridagawa, also in Wakayama, produces a specialty variety with large, grape-like fruit clusters. In Japan, the thornless variety comes from the Asakura district. This district was part of the former Yabu region. These regional specialties show how different environments shape the plant's use.

The culinary uses of Z. piperitum are vast and varied. In Japan, pulverized mature berries are a standard spice for kabayaki-unagi, or broiled eel. They are also a key ingredient in shichimi, a blended spice containing red chili peppers. Young leaves, called kinome, are used to garnish fish and soups. In Korea, dried chopi fruit is used in loach soup and spicy fish stew. The leaves are also used in pancakes, fritters, and even herbed fish sauce.

Chemical analysis explains the plant's unique sensory profile. The seeds contain high concentrations of glucosides. These are sugar-modified derivatives of N-methylserotonin and bufotenin. The intense, pungent taste comes from specific substances called sanshool and sanshoamide. The plant also contains aromatic oils like geraniol, citral, and dipentene.

Beyond food, the plant has roles in medicine and nature. In Japanese pharmaceuticals, the mature husks are used as a crude medicine. The thick wood is sometimes carved into a wooden pestle for a suribachi mortar. In the wild, the plant serves as a host for the citrus butterfly, Papilio xuthus. In southern Korea, the fruit is even used in fishing. Because the fruit is poisonous to small fish, it can be used to make them float in a pond.