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.

Pickup available at Aiken Nursery

Usually ready in 2-4 days

PLANT DETAILS

Hardiness Zones: 6 - 9

Soil: Loam and Moist

Sun: Full Sun and Part Shade

Seasonal Behavior: Deciduous

Growth Rate: Moderate

Height at Maturity: 12 - 15 feet

Spread at Maturity: 6 - 8 feet

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.

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.

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