Sitka Alder

Sitka alder is recognized by its sinuate (wavy) leaf margins and reddish-brown bark along stream banks and avalanche paths from Alaska south to northern California. This subspecies thrives in wet, disturbed sites where it stabilizes soil and adds nitrogen, making it especially valuable after disturbance in montane and coastal regions. It grows to 20 to 35 feet.

Sitka alder tolerates part shade to full sun and prefers consistently moist to wet soils (Zones 2a to 8b). It 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.