Alder, Seaside

Alnus maritima

$23.00
Low Stock

1 Gallon | Hardiness Zones 6-9

Seaside Alder is a medium to large deciduous shrub with glossy oval, toothed leaves. Flowers are elongated catkins followed by small pinecone-like fruits. This rare species is unusual in several respects. It flowers in the fall, other native Alders flower in spring, and it has a very curious native range. It is found in a limited area on the Eastern Shore of Maryland and adjacent Deleware, and in one area in Oklahoma. A more recently discovered population is in north Georgia. Genetic studies suggest that the now widely separated populations are distinct sub-species evolved from a once widespread population. Our material is from the eastern population. It is rare in cultivation but is adaptable to moist sunny locations and to ordinary garden soils.
Plant Specs
  • Zones: 6 - 9
  • Sun: Full Sun and Part Shade
  • Soil: Loam and Moist
  • Height at Maturity: 12 - 15 feet
  • Spread at Maturity: 6 - 8 feet
  • Growth Rate: Moderate

Deciduous
Flower/Foliage

Alnus maritima produces flowers in the form of catkins. The male catkins are long and pendulous, typically yellowish-brown, and appear in clusters. They develop in late summer and release pollen in the spring. The female catkins are shorter, more upright, and reddish-brown. After pollination, these female catkins mature into small, woody cones that persist on the tree through winter, adding ornamental interest.
Care Info

Read full care instruction manual here.

Light Requirements: Prefers full sun to partial shade, thriving best with ample direct sunlight.

Soil Requirements: Grows well in moist, well-draining soil; it is adaptable to a range of soil types, including clay and loamy soils, and prefers slightly acidic to neutral pH.

Watering: Requires consistent moisture, especially in the establishment phase, and performs best in areas with regular water supply, but it can tolerate brief periods of drought once established.

Temperature and Humidity: Hardy in USDA zones 5-8, tolerating a range of temperatures and preferring temperate climates.

Fertilization: Generally does not require heavy fertilization; an annual application of compost or a balanced, slow-release fertilizer in early spring can support growth.

Pruning: Minimal pruning is needed; remove dead or damaged branches as necessary, preferably in late winter or early spring before new growth starts.

Pests and Problems: Generally pest-free but watch for occasional leaf spots and canker; ensure good air circulation to prevent fungal diseases.

Suitable Environment: Ideal for wetland areas, along streams, and in gardens that require soil stabilization; it can also be used as a landscape tree for ornamental purposes due to its attractive catkins and foliage.

By following these care instructions, you can maintain a healthy and robust Alnus maritima, commonly known as the seaside alder, valued for its adaptability and ecological benefits.

Pickup available at Aiken Nursery

Usually ready in 2-4 days

Grown in Aiken, South Carolina

At Woodlanders, we are committed to quality.

All our plant material is carefully propagated, grown, and nurtured at our humble nursery in Aiken, South Carolina.

Learn more about Woodlanders here.

Here’s a closer look at how we produce our plants:
from rooting to shipping, our top priority is ensuring you receive healthy, thriving plants for your garden’s success.

The majority of our plants are carefully cultivated from rooted cuttings, while we also utilize propagation methods such as seed, air layering, and grafting, thoughtfully chosen to suit each plant’s unique needs.

Our plants are cultivated using sustainable practices, including organic soil blends and eco-friendly pest management, ensuring they thrive while minimizing environmental impact.

We are proud to contribute to local biodiversity through ongoing donations to the Aiken Arboretum and support for local wildlife conservation efforts, helping to preserve and enhance our community’s natural ecosystems.

Plant Success Tip #1

Unpack Promptly

Carefully unpack your plant as soon as it arrives. Check the roots and soil to ensure they are still moist. If the roots feel dry, lightly mist or water them before proceeding with planting or temporary storage.

Plant Success Tip #2

Acclimate Your Plant

Allow your plant to adjust to its new environment by placing it in a sheltered spot for a day or two before planting, especially if it has traveled a long distance. Avoid exposing it to extreme temperatures right away.

Plant Success Tip #3

Follow Planting and Care Instructions

Plant your new arrival as soon as possible, following the specific care guidelines provided. If planting outdoors isn’t immediately possible, temporarily pot it in well-draining soil to maintain health until conditions are suitable.

Read Care Instructions

Frequently Asked Questions

What to expect upon delivery

All our plants are sold in 1-gallon sizes, though the height of each plant can vary depending on its growth rate and seasonality, typically ranging from 1/2 to 2.5 feet.

Each plant is carefully packaged with its roots enclosed in a secure plastic bag containing moist soil, forming a compact root ball. To ensure safe transport, the box is padded with recycled newspaper, providing both stability and eco-friendly protection from weather during shipping.
What is your return policy?

Review our full return policy information on our SHIPPING AND RETURNS POLICY page.
What payment methods can I use?

We offer 35 different payment methods including major providers like Mastercard, Visa, PayPal, American Express and Diners as well as many different local payment methods including Klarna, iDEAL, AliPay, Sofort, giropay, and many more.
Can I make changes to my order after it’s been placed?

At Woodlanders, we strive to fulfill orders as quickly as possible. Therefore, we can only accommodate changes to your order within the first 24 hours after it has been placed. These changes include adding or removing products and modifying the delivery address. If you need to make any changes or if there has been a mistake with your order information, please reach out to us promptly via our CONTACT page with your order number for the quickest resolution.

Your satisfaction is our priority, and we appreciate your understanding and cooperation.