Alnus serrulata (Hazel Alder) is a tough, adaptable native that naturally forms a multi-stemmed shrub or small tree along streams, ponds, and other damp ground. You will get fresh green foliage through summer, distinctive catkins in late winter to spring, and small cone-like fruits that often persist into winter for added texture and seasonal interest.

Plant it where soil stays consistently moist, including rain gardens, pond margins, and low spots that hold water. It also works well in restoration-style plantings and along banks, where its fibrous roots help hold soil. For best vigor, give it full sun to part shade; it will tolerate some shade, but it typically grows fuller with more light.

As it matures, expect roughly 10-20 feet in height with an 8-15 foot spread, often forming a thicket over time as stems develop from the base. This habit can be useful when you want a natural screen or a stabilizing planting, and it can be managed by selectively removing older stems at ground level to keep the plant open and vigorous.

Routine care is simple. Water during establishment, then rely on natural moisture where possible. Choose neutral to slightly acidic soils when you can, and avoid sites that run strongly alkaline. Once established, maintenance is mainly occasional thinning and monitoring for typical alder issues such as canker or powdery mildew, especially where air flow is limited.

Specifications

• Cold hardiness zone: 4-9 (-30 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Growth rate: Fast
• Mature height: 120-240"
• Spread: 96-180"
• Tolerant of: Drought, Wet Conditions
• Good for erosion control: Yes
• Native to the U.S.: Yes

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