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September Sun Alder

Alnus maritima 'September Sun'

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September Sun Alder (Alnus maritima 'September Sun') at Schulte's Greenhouse & Nursery

September Sun Alder foliage

September Sun Alder foliage

(Photo courtesy of NetPS Plant Finder)

Height:  20 feet

Spread:  15 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  4b

Other Names:  Oklahoma Alder, Seaside Alder, Beach Alder

Description:

Quite unlike the species this variety forms a compact tree, but fills out quickly and has dense foliage; a good general purpose landscape tree with good fall color; tolerant of ocean spray and salt, ideal for seaside plantings

Ornamental Features

September Sun Alder features subtle orange catkins hanging below the branches from late summer to early fall. It has forest green foliage throughout the season. The oval leaves turn an outstanding orange in the fall. The fruit is not ornamentally significant.

Landscape Attributes

September Sun Alder is a dense multi-stemmed deciduous tree with a distinctive and refined pyramidal form. Its average texture blends into the landscape, but can be balanced by one or two finer or coarser trees or shrubs for an effective composition.

This is a relatively low maintenance tree, and is best pruned in late winter once the threat of extreme cold has passed. It has no significant negative characteristics.

September Sun Alder is recommended for the following landscape applications;

  • Shade
  • Vertical Accent

Planting & Growing

September Sun Alder will grow to be about 20 feet tall at maturity, with a spread of 15 feet. It has a low canopy with a typical clearance of 2 feet from the ground, and is suitable for planting under power lines. It grows at a fast rate, and under ideal conditions can be expected to live for 40 years or more.

This tree does best in full sun to partial shade. It is quite adaptable, prefering to grow in average to wet conditions, and will even tolerate some standing water. It is not particular as to soil type or pH, and is able to handle environmental salt. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selection of a native North American species.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Shade  Articulation 
Applications
Flowers  Fall Color  Plant Form 
Ornamental Features