Alnus serrulata (Smooth Alder) is a versatile North American native shrub valued for its attractive foliage, distinctive catkins, and important benefits for wildlife and healthy ecosystems. This deciduous, multi-stemmed shrub typically forms a dense, upright habit and produces rounded green leaves with finely toothed edges. In early spring, Smooth Alder develops dangling catkins that provide an important early-season pollen resource for native insects before many other plants begin to bloom.
Alnus serrulata is particularly well adapted to moist soils and is an excellent choice for rain gardens, wetland edges, stream banks, pond margins, woodland gardens, and naturalized landscapes. As a member of the alder family, it can form beneficial relationships with nitrogen-fixing bacteria, helping enrich soils and making it especially valuable in restoration and habitat plantings.
Its dense growth also provides cover and nesting habitat for birds and other wildlife. With its adaptability to wet conditions, ecological importance, and ability to support native habitats, Smooth Alder is an excellent choice for gardeners and land managers looking to incorporate a resilient native shrub into wildlife gardens, restoration projects, and sustainable landscapes.