Caucasian Alder is a handsome medium to large deciduous tree native to the wooded gorges and stream banks of the Hyrcanian forests south of the Caspian Sea, spanning northern Iran and southern Azerbaijan. Mature trees reach 50 to 80 feet tall with a 25 to 50 foot spread, forming a broadly oval to conical canopy with spreading branches. Hardy in zones 5 through 8, it thrives in moderate moisture and tolerates clay and wet soils that would challenge many other shade trees, making it an excellent choice for stream-side plantings and landscapes prone to seasonal flooding.
Partial Sun
Moderate
5-8
960in H x 600in W
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High
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Young twigs and buds wear a distinctive dense coating of fine hair, giving the developing canopy a soft, almost velvety appearance in spring. This moisture-loving tree actually dislikes drought conditions, so it shines in wet or damp sites where other trees struggle. It prefers part shade when establishing but gradually develops the constitution to handle fuller sun as it matures, offering remarkable flexibility in site placement once established.
Caucasian Alder functions as a shade tree in landscapes and thrives in naturalized plantings, particularly in riparian zones, wetland restoration projects, and streamside stabilization where its tolerance for wet soils and flooding makes it invaluable. Its spreading branching habit and moderate growth rate suit it well for parks, woodland gardens, and larger residential landscapes seeking native or near-native character with minimal maintenance demands.
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Transplant Caucasian Alder in spring or fall, choosing a site with evenly moist to wet soil and full sun to partial shade exposure. Young trees especially benefit from afternoon shade in hot climates. Space trees 25 to 50 feet apart at maturity to allow full canopy development. Amend clay or poor soils with organic matter to improve fertility and water retention, particularly if moisture cannot be relied upon naturally. Water deeply after planting and maintain consistent soil moisture through the first growing season.
Prune young Caucasian Aldersparingly to establish a strong central leader and remove competing stems or crossing branches. Once mature, this tree requires minimal maintenance pruning; remove dead, diseased, or storm-damaged wood as needed. Avoid heavy pruning, which can stress the tree and invite disease entry. If trunk or stem cankers appear, prune affected branches back to healthy wood and disinfect tools between cuts to prevent disease spread.
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“Caucasian Alder originates from the ancient Hyrcanian forests that stretch along the southern and western shores of the Caspian Sea in present-day Iran and Azerbaijan, ecosystems renowned for their botanical richness and endemic species. This tree evolved in the cool, moist gorges and valley watercourses of this region, adapted over millennia to seasonal flooding and the humid continental climate of those mountain watersheds. Its introduction to temperate gardens in the West represents a direct link to one of Earth's most biodiverse and historically significant forest regions.”