Sitka Alder

You recognize Sitka Alder by its sinuate (wavy) leaf margins and reddish-brown bark along PNW stream banks and avalanche paths. This subspecies thrives in the wet, disturbed sites where it stabilizes soil and adds nitrogen, making it especially valuable after disturbance in montane and coastal regions.

Sitka Alder tolerates part shade to full sun and prefers consistently moist to wet soils (zones 2a-8b). It grows to 20-35 feet and matures quickly, making it useful for erosion control and habitat restoration. Disease susceptibility matches its parent species; monitor for leaf spot, rust, and stem cankers. Its aggressive suckering habit suits naturalized areas but requires management in tighter landscapes.