Nettles are flowering plants belonging to the genus Urtica, known for their stinging hairs that can cause a painful rash upon contact with skin. They typically grow in temperate regions and are often found in disturbed areas, such as roadsides and gardens. Nettles are rich in nutrients and have been used in traditional medicine and cooking. The most common species is the stinging nettle (Urtica dioica), which has green, serrated leaves and small green flowers. Nettles are also important for wildlife, providing habitat and food for various insects and birds. They can be harvested for their leaves, which are edible when cooked.