Wild rice

Wild rice, also known as manoomin, refers to any of four grass species within the genus Zizania. These plants produce a grain that is harvested for food in North America and parts of China. While it shares a botanical tribe, Oryzeae, with domesticated rice species like Oryza sativa, wild rice is a distinct type of grass. The grain features a chewy outer sheath and a tender inner core with a slightly vegetal taste.

These plants thrive in shallow waters, such as slow-flowing streams and small lakes. Often, only the flowering head of the plant rises above the water's surface. This unique environment supports diverse aquatic wildlife, including dabbling ducks that eat the grain.

There are three distinct species native to North America. Northern wild rice, Zizania palustris, is an annual plant found in the Great Lakes region. It grows in parts of the United States, such as Minnesota and Michigan, and in Canada, including Ontario and Manitoba. The second species is Southern or annual wild rice, Zizania aquatica. This annual plant grows in the Saint Lawrence River and along the Atlantic and Gulf coasts of the U.S. The third species is Texas wild rice, Zizania texana. Unlike the others, this is a perennial plant found only in a small area along the San Marcos River in central Texas.

Because its range is so limited, Texas wild rice faces extinction due to habitat loss and pollution. Its pollen can only travel a short distance from the parent plant. If a female flower does not receive pollen, it cannot produce seeds.

A fourth species, Manchurian wild rice, is native to China. In its native range, it has almost disappeared from the wild. However, it has been introduced to New Zealand, where it is considered an invasive species. In China, people primarily grow this plant for its stems rather than its grain.

The stems are used as a vegetable and become swollen and crisp due to an infection with the smut fungus, Ustilago esculenta. This fungus prevents the plant from flowering, so the crop is grown asexually from mother plants. Farmers must harvest the stems between 120 and 170 days after planting. They must act before the infection turns the stems black and causes them to disintegrate into spores.

Indigenous peoples have harvested wild rice for centuries using traditional methods. Many cultures, such as the Ojibwe, Dakota, and Menominee, consider the plant sacred. The Ojibwe call it manoomin, which translates to "good berry."

Harvesting often involves traveling by canoe into stands of the plant. One person paddles slowly while another uses two wooden sticks called knockers or flails. These tools are used to gently brush the ripe grain heads. This motion dislodges the seeds into the canoe without beating the plants. Some seeds fall to the muddy bottom to germinate later in the year. In Minnesota, state laws even regulate the size and weight of these knockers.

Archaeologists study the history of wild rice through the physical remains left by ancient cultures. In the mid-1800s, observers noted depressions in the ground near lakes. These were "jigging pits" where people placed animal hides in holes to thresh the rice. They would then stomp on the rice to remove the husks.

Historically, wild rice was vital during the fur-trading era. It could be stored for long periods, making it a reliable food source in hard-to-reach regions. Today, the connection remains strong. In 2021, the White Earth Nation of Ojibwe filed a lawsuit to protect wild rice habitats from oil pipelines.

Wild rice is highly nutritious and has become more popular in the late 20th century. It is high in protein, dietary fiber, and the amino acid lysine. It is also low in fat and contains no gluten.

For every 100 calories, wild rice has a protein content second only to oats. A single cup of cooked wild rice provides over 20% of the daily value of manganese. It also provides significant amounts of niacin, magnesium, phosphorus, and zinc. However, consumers must be careful of the ergot fungus. This toxic fungus can cause pink or purplish blotches on the seeds, making them dangerous to eat.

Commercial cultivation began in the 1950s to meet growing demand. James and Gerald Godward began experimenting with the crop in a one-acre meadow in Minnesota. They built dikes and ditches to control the water in the area. They discovered that they could successfully grow the rice in flooded paddy fields.

Today, the main producers in the United States are California and Minnesota. In Canada, Saskatchewan is the largest producer. Other countries, such as Hungary and Australia, also cultivate wild rice. This transition from a wild gathered food to a commercial crop shows how deeply humans interact with this unique grass.