reed

Reed is a common name for several tall grasses in the family Poaceae. The term most often refers to the common reed (Phragmites australis), a perennial wetland grass that forms dense stands along riverbanks, shores, and marshes. Another well-known member is giant reed (Arundo donax), grown ornamentally and for its fibrous stem in some regions. Reeds are typically tall, with hollow, jointed culms and feathery inflorescences. They have a variety of traditional uses, including thatching, fencing, and matting; in wetlands, they provide habitat for wildlife. In some regions, Phragmites is considered invasive and can outcompete native plants.

Beyond botany, Reed is a surname and a given name in English-speaking countries, and the word appears in many place names and institutional titles.

In music, a reed is a thin, flexible blade that vibrates to produce sound in wind instruments. A single reed, usually made from Arundo donax cane, is attached to the mouthpiece of instruments such as clarinets and saxophones; a double reed comprises two blades used by oboes and bassoons. Reeds are shaped and maintained to control response, pitch, and tone, and they may be adjusted or replaced as needed.

In electronics, a reed switch consists of two ferromagnetic reeds sealed in a glass envelope. The reeds come together or separate in response to a magnetic field, closing or opening the circuit. Reed switches and reed relays are used in sensing, security devices, and low-power control systems.

There are places named Reed in several countries, and the word also appears in the names of schools, organizations, and commercial brands.