What "marsh" means in gardening

A marsh is a type of wetland ecosystem that is dominated by herbaceous plants, such as cattails, rushes, and sedges. It is characterized by a constantly saturated soil, shallow water, and low oxygen levels. Marshes can provide important habitat for wildlife, such as birds, amphibians, and insects, and can also serve as natural water filtration systems. In gardening, marsh plants can be used in water gardens or other areas where moisture is abundant.