Ground shipping is currently paused. Local deliveries throughout Long Island will continue as usual. Pre-orders for fall are now open. Non-local orders will begin shipping again in early September. Click here to learn more.

Alnus serrulata – Smooth Alder

Additional information

Size

Common Name

Type

Family

Native?

Zone

4, 5, 6, 7, 8, 9

Height Range (ft.)

10 to 20

Spread (ft.)

10 to 15

Bloom Time

,

Bloom Description

greenish female flower clusters, reddish male catkins, Small

Sun

,

Water

Maintenance

Suggested Use

, , , ,

Tolerate

, , ,

Attracts

Growth Rate

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Alnus serrulata – Smooth Alder

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Smooth alder is a native shrub or small tree that thrives in wet soils and supports healthy ecosystems. A dependable choice for rain gardens and naturalized landscapes.

$21.99

Please note: Sizes 1.5 Gallon and up can’t be shipped outside the counties of Nassau, Suffolk, and Queens.

Learn more about how the process works and how our plants are delivered.

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Ground shipping is paused due to summer heat. Only local delivery (Long Island & Queens) is available. Orders placed during the pause will begin processing September 1, and ground shipping will resume September 15.

Click here to learn more.

Additional information

Size

Common Name

Type

Family

Native?

Zone

4, 5, 6, 7, 8, 9

Height Range (ft.)

10 to 20

Spread (ft.)

10 to 15

Bloom Time

,

Bloom Description

greenish female flower clusters, reddish male catkins, Small

Sun

,

Water

Maintenance

Suggested Use

, , , ,

Tolerate

, , ,

Attracts

Growth Rate

Product Description

This adaptable native shrub or small tree is valued for its ability to thrive in wet conditions and its important ecological role. Smooth alder is a dependable choice for challenging sites, offering strong structure and natural beauty while supporting surrounding ecosystems.

Smooth alder develops a multi-stemmed form with upright branching and clean green foliage. In early spring, subtle catkins appear before the leaves fully emerge, adding quiet seasonal interest. Its ability to tolerate moist soils and periodic flooding makes it especially useful in low areas where other plants struggle.

Well-suited for home landscapes and naturalized settings, Alnus serrulata performs best in full sun to part shade and prefers moist to wet soils. It is easy-care once established and is often used for erosion control, stream banks, and rain garden edges, making it a reliable option for gardeners working with water-prone sites.

Why choose Alnus serrulata – Smooth Alder

Native adaptability: Thrives in wet and moisture-retentive soils
Soil improvement: Helps enrich soil through nitrogen fixation
Natural structure: Upright, multi-stemmed growth habit

Cultivating tips

Sun exposure: Full sun to part shade
Soil needs: Moist to wet soil; tolerates periodic flooding
Maintenance: Low; minimal pruning needed

Designs for your garden

Rain gardens: Performs well in consistently moist areas
Stream and pond edges: Helps stabilize soils
Naturalized plantings: Blends seamlessly into native landscapes
Erosion control: Useful on slopes and wet ground

Ecological benefits

Native habitat value: Supports birds, insects, and other wildlife
Soil stabilization: Helps reduce erosion in wet areas
Ecosystem support: Improves soil health and moisture retention

Plant appearance may vary by season and growing conditions. All plants ship healthy with established root systems.

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Alnus serrulata – Smooth Alder

$21.99
Frequently Asked Questions

How large does Alnus serrulata (Smooth Alder) grow?

Smooth Alder is a multi-stemmed, deciduous shrub or small tree, typically growing 10 to 20 feet tall with a similar spread. It forms a rounded, dense thicket of upright stems and is ideal for wetland edges, stream banks, and naturalized plantings.

What are the ideal growing conditions for Smooth Alder?

Smooth Alder thrives in full sun to partial shade and prefers moist to wet soils, including streambanks, pond edges, and rain gardens. It tolerates periodic flooding, clay soils, and poor drainage, making it an excellent choice for restoration projects and erosion control.

Does Alnus serrulata improve soil health?

Yes! Like other alders, Alnus serrulata forms a symbiotic relationship with nitrogen-fixing bacteria in its root nodules, allowing it to enrich poor soils by adding nitrogen. This makes it valuable for ecological restoration and for improving disturbed or degraded sites.

Is Smooth Alder deer-resistant and easy to maintain?

Smooth Alder is generally not preferred by deer, especially once established, though young plants may be browsed in areas with high pressure. It is low-maintenance, typically requiring no pruning unless shaping or thinning is desired. It spreads by suckers, which can be managed or encouraged for thicket formation.

Does Alnus serrulata benefit wildlife or pollinators?

Absolutely! Smooth Alder provides early spring catkins that offer pollen for native bees, and its woody structure offers nesting and cover for birds. The seeds are eaten by small mammals and songbirds, and it supports native moth and butterfly larvae.

Looking for the perfect gift for the garden lover in your life?

Our gift cards make it easy to share the beauty of plants, flowers, and all things green. Whether for a special occasion or just because, give the gift of choice and let them select their favorites to create a garden they’ll cherish.

Only Local Delivery Available (Long Island & Queens)

Ground Shipping Paused

To protect our plants from extreme summer heat, we’ve paused nationwide ground shipping to avoid any damage during transit.

Local Delivery Only

We’re still delivering locally to Long Island and Queens, so nearby customers will continue to receive orders as usual.

Fall Pre-Orders Are Open Nationwide!

We will resume normal shipping for non-local orders placed during the pause in early September.

Thank you for your support and understanding—we’re looking forward to growing with you this fall!