alder

Alder trees have simple, alternate leaves and their bark is often smooth and gray. They are also known for their cone-like fruit, which are called alder cones. Some species of alder trees are commonly used for woodworking, as the wood is strong and durable. In addition, alder trees are important for their ecological benefits, as they help to improve the soil in their surroundings and provide habitat for a variety of animals.

This is because they have a symbiotic relationship with a type of nitrogen-fixing bacteria that lives on their roots. The bacteria convert nitrogen from the air into a form that the trees can use for growth, and in turn, the trees provide the bacteria with a place to live and resources like carbon. This process, known as nitrogen fixation, helps to enrich the soil and makes it more fertile. As a result, other plants and trees are able to grow more easily in the area around alder trees, which can help to support a diverse ecosystem.