Grey alder is a deciduous tree that is commonly found in wetlands and along riverbanks. It is also known as Alnus incana or speckled alder due to its distinctive bark, which is smooth when young but becomes rough and fissured as it ages. Other synonyms for grey alder include silver alder, white alder, and mountain alder. The tree typically reaches a height of 20-30 feet and can live up to 150 years. It is commonly used in landscaping and erosion control due to its ability to grow in wet and disturbed soils. Additionally, grey alder is considered an important habitat for wildlife, providing food and shelter for birds and mammals.