Adzuki bean

The red bean is a small seed.

It grows on a green plant. This plant has bright yellow flowers.

The beans grow inside long green pods. The pods turn white or gray as they get old. These seeds can be red, black, or even white.

People in East Asia love these beans. They boil the beans with sugar. This makes a sweet paste. People use the paste in many treats. It is even used in ice cream!

The adzuki bean is a small seed.

Most people know them as red beans. They grow on a bushy plant. This plant is an annual, which means it lives for one year.

The plant has bright yellow flowers. These flowers grow in small groups. The beans grow inside smooth green pods. These pods can hold 2 to 14 seeds. As the pods get old, they turn white or gray.

Most adzuki beans are red. But some are white, black, or gray. Scientists think these beans came from wild plants in East Asia. People began growing them a long time ago. In Japan, they make many sweet treats with them. They boil the beans with sugar to make a red bean paste. This paste goes into ice cream and buns. Some people even make a sweet soup with them.

Cooked beans give us power and vitamins. They have a lot of folate, which is a good vitamin. They also have protein to help us grow.

The adzuki bean is a small seed used all over East Asia.

Most people know them as red beans. They come from a plant called Vigna angularis. This plant is an annual vine or a bushy herb. It usually grows between 30 and 100 centimeters tall. While most beans are red, some are white, black, or gray.

These little beans are very important for food in many countries.

Growing the plant follows a specific way it works. First, the seeds sprout and take 7 to 20 days to emerge. The plant grows slowly compared to other beans. It reaches maturity in 80 to 120 days.

Bright yellow flowers appear in small groups along the stem. These flowers help make the beans through pollination. The beans grow inside smooth, green, cylindrical pods. Each pod can hold between 2 and 14 seeds. As the pods get older, they turn white or gray.

History shows that humans have worked with these beans for a long time.

Archaeologists think people began domesticating them around 3000 BC. Some evidence suggests they were grown in Japan for over 10,000 years. Scientists believe the wild ancestor lived near the Himalayas. This wild plant then spread to China and Japan. Over time, humans selected for larger seeds and different colors. This changed the plant from its wild form.

There are many interesting facts about how they are grown today.

In Japan, the adzuki bean is the second most important legume after the soybean. In 1998, the yearly yield in Japan was about 114,000 tons. China has very large collections of these beans. The Institute of Crop Germplasm Resources in Beijing holds over 3,700 different types. Japan also has a large collection in Hokkaido with 2,500 types. These plants like soil that is not too acidic. They grow best when the soil temperature is above 15 degrees Celsius.

Adzuki beans are famous for making sweet treats.

In Japan, people boil the beans with sugar to make a red bean paste. This paste is a filling for many snacks like anpan or taiyaki. In China, the paste is used in mooncakes and sweet soups. Even rice can be made special by adding these beans.

These beans are also very good for your body. They provide a lot of folate, which is a B vitamin. They also contain protein and fiber to help you stay healthy.

The adzuki bean, scientifically known as Vigna angularis, is a small, important legume.

It is widely cultivated across East Asia for its tiny seeds. While most people recognize them by their uniform red color, many other varieties exist. These include white, black, gray, and even mottled types. The plant itself is an annual vine or a bushy herb. It can grow as a climbing plant or a low, spreading one.

This plant is a vital part of many food systems and agricultural traditions.

Understanding the life cycle of the adzuki bean reveals a slow, steady process. The growth begins with hypogeal emergence, meaning the seed leaves stay below the soil. This emergence process typically takes between 7 and 20 days. Compared to other pulses, the adzuki plant grows quite slowly. It generally reaches full maturity within 80 to 120 days.

During this time, bright yellow, papilionaceous flowers appear in small clusters. These flowers are part of an axillary false raceme. Most plants self-pollinate to produce seeds, though cross-pollination can also occur.

The structure of the plant is very specific. The roots consist of a taproot system that can reach deep into the soil. Along the stem, the plant grows trifoliate, pinnate leaves. These leaves are arranged alternately on a long petiole. The fruits are smooth, cylindrical pods with thin walls. These pods start green and turn white or gray as they mature.

Each pod contains between 2 and 14 seeds. As the seeds ripen, the pods may shatter, which can make harvesting difficult.

The history of the adzuki bean involves complex movements across Asia. Scientists believe the wild ancestor, Vigna angularis var. nipponensis, lived near the Himalayas. This wild plant likely spread to central China and Japan.

Archaeological evidence suggests domestication began around 3000 BC. Some studies show that wild azuki may have been cultivated in Japan for over 10,000 years. Genetic studies show that modern cultivars descended from wild plants in eastern Japan. These plants later spread to China and hybridized with local wild varieties.

Domestication changed the physical traits of the bean significantly. Humans selected for specific "domestication syndromes," such as changes in seed coat color. They also selected for plants that did not shatter their pods easily. This created a trade-off between total yield and seed size. Cultivated beans have fewer but larger seeds than wild ones. They also have fewer but longer pods and a shorter plant stature.

While they have larger seeds, cultivated plants often have a smaller overall seed yield.

Today, the adzuki bean is a major agricultural crop with massive production numbers. In Japan, it is the second most important legume after the soybean. In 1998, the annual yield in Japan reached approximately 114,000 tons. China holds massive genetic collections, including over 3,700 accessions at the CAAS in Beijing. Japan also maintains a large collection of 2,500 accessions in Hokkaido.

The beans grow best in soil with a pH between 5 and 7.5. They require soil temperatures above 15 degrees Celsius to germinate successfully.

In the kitchen, adzuki beans are famous for their sweet applications. In East Asian cuisine, they are often boiled with sugar to create a red bean paste.

This paste is a central ingredient in many traditional treats. In Japan, it is used in snacks like anpan, taiyaki, and daifuku. In China, it is used in mooncakes and sweet soups like hong dou tang.

The beans are also highly nutritious. Cooked beans provide 30% of the Daily Value for folate. They are also a good source of protein and dietary fiber.