Phragmites australis

This grass is called the common reed.

It grows in very wet places. It can grow in deep water. It can even float on top.

The tall stems have long leaves. In late summer, it grows dark purple flowers. The plant can grow very fast. It spreads by using runners under the ground. Some people even use the stems for straws. You can also eat the young shoots. It is a very busy plant!

The common reed is a type of grass.

It loves wet places like marshes. It can grow in shallow water or deep water. It can even grow as a floating mat. The tall stems have long, broad leaves. In late summer, the plant makes dark purple flowers. Later, it grows small seeds with silky hairs. These hairs help the seeds move to new spots.

In North America, some reeds are a problem. These are non-native plants from Europe. They are very strong and grow fast. They can crowd out other plants like wild rice. They also block light from reaching the ground. The reed makes a chemical called gallic acid. When light hits this acid, it turns into a toxin. This toxin can hurt other small plants. To get rid of them, people may burn the plants. They might have to burn them for two or three years. This is because the roots are very deep and strong.

People can use this plant in many ways. You can eat the young shoots. You can even make flour from the stems. The roots can be used like cattails. Some people use the stems to make straws.

The common reed is a tall grass that lives in wet places. It belongs to the grass family called Poaceae. You can find this plant in many parts of the world. It loves damp ground and standing water. It can grow in water that is quite deep. It can even form a floating mat on top of the water. These plants often grow together in huge groups called reed beds.

This plant has a very busy way of growing. It can spread by using horizontal runners under the ground. These runners put down new roots at regular spots. The stems grow straight up and can become very tall. The tallest plants live where the summers are hot and the soil is rich. In late summer, the reed grows dark purple flowers. These flowers are part of a shape called a panicle. Later, tiny seeds appear with silky hairs to help them travel.

Scientists study different types of these reeds to see where they come from. In North America, there is a lot of talk about these plants. Some reeds arrived from Europe in the 1800s. These European reeds are much stronger than the native ones. The native kind is called Phragmites americanus. The European kind is called Phragmites australis subsp. australis. The strong European plants can crowd out native plants like wild rice or orchids. They can even turn a whole area into a place with only one kind of plant.

These strong reeds can be quite hard to manage. They release a substance called gallic acid into the area. When ultraviolet light hits this acid, it turns into a toxin. This toxin can hurt other small plants and seedlings. To stop them, people sometimes have to burn the reeds. You might have to burn them for two or three seasons. This is because the roots are very deep and strong. In some places, like the Mississippi River Delta, these reeds help keep the shorelines steady.

Even though they can be tough, people use the reed in many ways. You can eat many parts of the whole plant. Young stems can be boiled or turned into flour. You can even eat the hardened sap from damaged stems. Some people use the stems to make eco-friendly drinking straws. In Europe, people use the reeds to make thatch for roofs. The root hairs are also great at filtering impurities from waste water. This makes them useful for natural water treatment systems.

Phragmites australis, commonly known as the common reed, is a flowering plant in the Poaceae family. This wetland grass is a helophyte, which means it is an aquatic plant. It has a cosmopolitan distribution, appearing in many different regions around the world. The plant thrives in damp ground and standing water. It can even grow in water that is quite deep. Some reed beds even form floating mats on the water's surface.

The growth mechanism of the common reed allows it to dominate large areas. It forms extensive stands called reed beds. These beds can reach a size of one hectare or more. The plant spreads using horizontal runners that grow under the ground. These runners put down new roots at regular intervals. This process allows the plant to expand by one meter or more every year. The erect stems grow very tall. The tallest plants appear in areas with fertile soil and hot summers.

In late summer, the plant produces flowers in a dense, dark purple panicle. This panicle is about 10 centimeters long. After the flowers, long and narrow spikelets appear. These spikelets look grey because they grow long, silky hairs. These hairs help the minute seeds disperse through the air. The plant also has long, broad leaves. Scientists can distinguish between different types of these reeds using specific parts. For example, the Eurasian phenotype has shorter ligules and glumes than the North American phenotype.

There is a complex history regarding these plants in North America. Many believe the reed was introduced from Europe during the 1800s. However, evidence shows Phragmites existed in North America long before European colonization. Scientists have identified a native genotype called Phragmites australis subsp. americanus. This is sometimes called Phragmites americanus. The Eurasian version is known as Phragmites australis subsp. australis. The European subspecies is much more vigorous than the native North American variety. This difference causes much of the current debate about its status.

The invasive European subspecies can cause significant ecological changes. It outcompetes native vegetation and lowers local plant biodiversity. It can displace native species like wild rice, cattails, and native orchids. The high above-ground biomass blocks light from reaching other plants. This allows the area to become a Phragmites monoculture very quickly. The plant also releases gallic acid into the environment. When ultraviolet light hits this acid, it turns into mesoxalic acid. Both substances act as toxins that can harm susceptible plants and seedlings.

Managing these large reed beds is a difficult task. The roots grow very deep and strong. Because of this, one single burn is often not enough to kill them. Eradication may require burning the plants over two or three seasons. Some researchers suggest that goats could be used to control the species. In some areas, natural enemies help. Since 2017, the invasive roseau cane scale has damaged over 80% of reed beds in the Pass a Loutre Wildlife Management Area. However, in the Mississippi River Delta, these reeds are critical. They help stabilize shorelines and prevent coastal erosion.

Humans find many useful ways to use the common reed. The entire plant is edible if it is raw or cooked. Young shoots can be eaten fresh, while stems can be boiled or made into flour. The seeds can be crushed with water and berries to make a gruel. In Europe, the plant is a primary source of thatch for traditional roofs. The stems can also be used to make eco-friendly drinking straws. Additionally, the root hairs are excellent at filtering impurities from waste water. This makes the plant useful for phytodepuration, or natural water treatment systems.