Mountain ash trees, also known as Sorbus aucuparia, are deciduous trees native to Europe and parts of Asia. They typically grow between 15 to 25 feet tall and are known for their striking clusters of small white flowers in spring, which later develop into bright orange-red berries. These berries are a food source for various birds and wildlife. The leaves of mountain ash trees are pinnate, meaning they have a feather-like appearance with multiple leaflets. They thrive in well-drained soils and are often found in mountainous regions, where they can withstand colder temperatures. Their attractive foliage and berries make them popular in landscaping.